Reddit mentions of ART USB Dual Tube Pre

Yes, there are recorders that can record multiple tracks. Like the Tascam DR-40 has XLR inputs. I'm not necessarily endorsing the Tascam. I have the DR-05 and find it acceptable quality. Something like the Zoom H4N has XLR connectors built in, so you could record a mic into those and use the built in condenser mics to record your guitar.

You left out some relevant information: Budget, can your guitar be plugged in or will you mic it? Do you have a pretty sound free workspace?

I think budget is the most important part here. I interpret 'nothing flashy' as being a cheap as it can get without being poor quality.

I'm gonna link to listings on Amazon because it's easiest, but B&H or if you live near a Guitar Center might be a better place to buy.

A possible setup:

• ART Dual USB Preamp - $80 - This will allow you to plug in one mic and your guitar and output the track to your computer via USB. Depending on the software, I believe you can have the tracks separate for editing, but they would separate into left and right channels that you'd then combine into a stereo track after editing.
  
  
  
• Shure SM58 - $100 - A dynamic vocal mic that will play well in a not so perfect recording space. Check out Regina Spektor using one during a concert. This mic is so popular I would make sure to only get it from a reputable dealer i.e. not used on ebay, because there are fakes floating around.
  
  If you need/want to mic your guitar then consider the SM-57. It is nearly identical to the SM58. Here is a guy demonstrating using one to record his guitar.
  
  
• If $100 is insanely out of your budget, then consider the Behringer XM8500 - $20 - Not as high quality as the SM58, but still a decent sound. Here is a guy comparing the SM57 to the XM8500 and is using just one mic for voice and guitar, without using a preamp, so keep that in mind when comparing the audio (I hear some noise in the audio, probably noise from the line to the camera, which I presume has some sort of automatic gain happening).
  
  This guy's video makes me wonder if just an SM57 with a decent preamp (i.e. one with clean gain) might be all you'd need... but that isn't ideal. You could go with two XM8500s, one for guitar and one for vocals ($40). Or one SM58 for vocals and one XM8500 for guitar($120). That all comes down to budget and preferences.
  
  
• You'll need a mic stand, or two. The On-Stage MS7701B is a best seller on Amazon. I own one of these and it isn't going to impress anyone. I've never had it tip over or seem unsteady. If you extend the boom arm too far it can sometimes slowly droop over time (I may be guilty of not tightening it enough due to not wanting to strip the threads) It does the job of holding a mic in place. If you go with two mics, you could get two of them. You could also get a desk stand for the mic that is recording your guitar and find a suitable place to set it, but I think the boom arm of the MS7701B will be useful for keeping the stand out of your way.
  
  
• And you will need cables. I recommend the cables from Monoprice, their Pro Audio series. It is not as user friendly to find the exact cables you'll need as a site like B&H, but I have had several of their cables and only had one die on me. All their cables have a lifetime warranty and the prices are shockingly low.
  
  
• And a windscreen or pop filter for the mics is nice. There is a decent windscreen on Amazon for 3 bucks, sometimes 2 bucks.
  
  Potential Changes & other thoughts -
  
  A more expensive preamp - ART Tube Dual Mic Preamp With USB - $190- this has some compression and a limiter. It's debatable whether in this range it would be better to get a decent mixer, a preamp for your vocals, and let the preamp on the mixer handle the guitar, or if something like this would be better. Like a Behringer mixer - Q802USB ($80) + ART single channel Preamp for vocals ($40/$50) would be less money than the Dual USB preamp.
  
  Or maybe just the Q802USB would suffice for your needs. It has preamps already built in. They are not the best preamps in the world. I mean... after all I wrote above, the more I think about it the more I think you should try a Q802USB and see if the sound is what you're wanting.
  
  Headphones - Add in some headphones to monitor your audio. ATH-M40x ($100) would be my recommendation, but this is where a lot of personal preference comes into the mix, no pun intended.
  
  Different mics - Rode has some mics that compare the the Shure SM57/58 that might be better. And the options for mic are virtually limitless, when you consider not just the mics can vary, but the audio interfaces and processing options. I really think a dynamic mic will be most user friendly for a one off home recording.
  
  I hope I haven't confused more than I helped. I think the essentials are this: good mics, clean gain, easy to use. Whether you get the dual channel ART preamp or the Q802USB, either will be easy to use. I would bet the gain on the ART preamp is cleaner, meaning less background hiss at higher levels, than the Q802USB, but perhaps that is just an unreasonable bias. In either case, the mic is going to be important and where your budget plays a big role. The SM58 and SM57 are superb for vocals and recording guitar. A condenser might be better if the acoustics of your recording space allow for it, but I hope you saw from the video I linked of the guy recording his guitar with the SM57 that a great sound can be achieved with a $100 mic. If that is out of your budget, keep in mind the XM8500, but the sound is not as clear as the Shure mics it tries to emulate.