To unlock secret places to live do the following:

to live in:
-the garbage can: get 100 rel. points with Phoebe Twiddle(can located in the glasstown enterance to club xizzle)
-the lost cave: get 100 rel. points with Ewan whattamee (cave located next to yar hey!bombard! minigame post)
-the projection booth: get 100 rel.points with Theresa Bullhorn(room located in cinema interior, door next to left entrance)
-Schoolbus: get 100 rel.points with Guiseppi Mezzoalato (bus located in urbania, opposite Phoebe's shop)