draco+severus
No noise or loud parties. No whining. I have a low tolerance for these things in general, and have spent enough time as Head of Slytherin House to receive enough of them for a life-time.
You would need to keep your area neat and clean, and I would like to be informed of any visitors ahead of time. I will afford you the same courtesy. I do brew potions occasionally, which may occasionally result in a smell, but I will inform you of the likelihood of such ahead of time.
In return you would be able to room with someone from our world who is a wizard and thus could discuss freely things from home without being treated as a curiosity. You would have access to my cauldrons and potions supplies that I am gathering, although I expect to be asked before specific ingredients are used.
Additionally a rare commiseration of the general lack of Slytherin house representation would be allowed, and perhaps expected. That is not whining, but simply statement of fact that must be expressed between two Slytherin house alum.