I have two bedrooms for guests, one upstairs near the master bedroom where I sleep, one downstairs. Each bedroom has a double bed and a washroom with a shower. There's also a single bed in the laundry room and a couch. My fee is $65 Canadian total no matter how many guests. You can use the kitchen and other shared space.
Leafy Bells Corners neighbourhood on the Greenbelt with good access to downtown. Perfect for cyclists (free bikes you can borrow), a cheap/friendly/interesting place to stay.