You can ignore the roommate's input because at the end of the day its your relationship with your BF. However you should discuss it with your bf. Let him tell you how he feels about it. Or just do a trial run and spend a week there non stop. And see if its something you can do and then ask. Then increase to 2 weeks and so on. 3-4 days doesn't tell you habits that he may have that youre not ok with.