We had a great time in Lisbon while staying at Diogo's place.
Diogo has converted his appartment into 3 separate rooms for different guests, but doesn't live there himself, so it feels more like a hotel running business than a real airbnb experience (if that's what you're looking for).
However, the rooms are very clean and tidy, the appartment is situated perfectly in the old city center amidst countless good restaurants and bars and the bathroom and kitchen are quite big and luxurious.