Reddit mentions of Romanian: An Essential Grammar (Routledge Essential Grammars)

I am also interested in this question, but I am in a different situation. After living in Romania for a few years, I have a child's grasp of spoken Romanian, but can read at a slightly higher level. This is because I can puzzle out meaning of words from context and from Latin root words that appear in English (and also because the phonetics of Romanian are simple, as /u/GlintEastwood mentioned)

But, of course, my ability to construct grammatical sentences is quite rough, both in speaking and in writing. I don't want to lose the ability to understand Romanian! It makes me special! So I'll share my tactics.

• I own a copy of http://www.amazon.com/Romanian-An-Essential-Grammar-Grammars/dp/0415338255/ It is written in English, but is all about Romanian Grammar. If you're a grammar nerd in English, this is awesome!
• I highly recommend children's literature, though maybe it is not necessary for you. The sentence structure is simple, the vocabulary is typically focused on the most commonly used words, and there are pictures to help suggest context. I really liked a Primul Meu Dictionar Illustrat'; I wish I had kept it.
• Maybe you can buy the course books for schoolchildren! They are probably just as boring as English grammar classes in the US, but maybe they're useful? Ask your cousin, or do it on your next visit. (Do you visit?)
• Read online news sites. I stopped doing this because a) usually I can only understand the headlines, and b) usually it is pretty depressing. Also, the BBC discontinued their Romanian language coverage.
• In emails to friends there (unless terribly time sensitive) I always use Romanian, as much as I can.

•• Google translate is your frenemy. Use it, but never trust it. ••

•Instead, use http://dexonline.ro gives complete declinations and conjugations, along with definitions. Copy and paste an entry into google translate and you'll be able to pickle out more of the subtleties of use. Again, if you already speak well, this may not be as helpful for you as it is for me.

My biggest challenge, seriously? Now I'm an American living in Brazil! The miniscule portion of my (miniscule) brain that can store foreign language is completely haywired after trying to stuff Brazilian Portugheze on top of the Romanian. A tiny bit of Portuguese pushes out huge amounts of Romanian! I've lost (laust?) any semblance (semblence?) of being able (abel?) to spell properly.

I have a Romanian news app on my phone that I can check. I also have the Cram app that lets me make flashcards and review them while I'm waiting in line, at the doctor's, etc. It's really helped my Romanian. You can also try a site like Interpals to speak with someone who knows Romanian. Also, get a Romanian grammar book. I recommend [this one] (http://www.amazon.com/Romanian-Essential-Grammar-Routledge-Grammars/dp/0415338255/ref=sr_1_1?ie=UTF8&qid=1454023556&sr=8-1&keywords=romanian+grammar). Hope this helps!

The best books I have found in my personal studies of Romanian are these:

A Course in Contemporary Romanian. An Introduction to the Study of Romanian. CAZACU, Boris. 1939.
This book has phonetic pronunciation throughout for most words, which is important for learning stress. It also has lots of charts and tables.

https://www.amazon.com/Course-Contemporary-Romanian-Introduction-Study/dp/B000XS7UMK/ref=sr_1_fkmr0_1?ie=UTF8&qid=1540634419&sr=8-1-fkmr0&keywords=A+Course+in+Contemporary+Romanian.+An+Introduction+to+the+Study+of+Romanian.+CAZACU%2C+Boris

Romanian: An Essential Grammar (Routledge Essential Grammars). Ramona Gönczöl. 2007

This book is full of charts and tables for learning Romanian's complicated morphological inflection system. I consider this book a must.

https://www.amazon.com/gp/product/0415338255/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

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Also use:

wiktionary.org

http://www.dictionare.com/

And online audioBibles with text, if you're into that sort of thing. PM me if you want more info on the Bibles.