You still have some time to write the letter, don't stress it. Keep a running draft for right now. As more ideas come up jot them down. Before you have to write the whole letter you will have enough ideas and will only have to figure out what order to organize them in. I would also confer with the counselor about what they feel you should put in the letter too, like whether or not you should let it be mushy, etc.
Good luck on the job front. You should look for the job and apartment where YOU want to live. He will take your lead either way and you have to think about what is convenient for you right now.
Keep your time with him light right now, if you can cut down on the R talk and just enjoy him and his company. You have all the time in the world when he gets back have R talk!!! Especially when your going to be living in the same place!!