i felt similarly when my T had suddenly switched from working out of a rented office room to doing sessions from his home. i said exactly the same thing you said at that first session in his home, that i felt too tainted to be allowed into his personal private space and that i would contaminate it. it took many sessions for me to become comfortable with the new space, but talking about it did help. also, since it was his place, it helped that he allowed his dog to sit along side with us, which i always found comforting. i started to bring a treat each week for his dog as part of a regular ritual that i looked forward to and which eventually helped to forge some sense of safety.