I just moved back to Seattle and stayed with Tim & Christy for a month while I went apartment hunting. Their room was basically a very nice one-bedroom apartment downstairs from their living space. They had plenty of household supplies ready for me and even a Welcome binder with helpful about how to get around and some recommendations for stuff to see and do in town. The only problem was that I did have access to a stove/oven or a freezer, but I suppose they probably do plan on people staying as long as I did. They DID offer to do a load of laundry for me, if I wanted.
Apart from that, I had a lovely stay and would definitely stay with them again.