Ianto/Jack/Martha
I get the feeling that being in a bedroom on the TARDIS would be more isolated than these ones, but then if you come out of your room it would get crowded quite quickly. Jack upsets the TARDIS anyway so it's not as much of an option for us. Visits are one thing, but...
He's in intake though so either one of us should be able to look up the housing registry and see what flats are partly filled. You should be able to request a move and that way you could try to find somewhere with someone who isn't a complete stranger, or who at least seems reasonable enough. You shouldn't worry about taking up space if it's going to be better for you.