The Apartment of Luis is a really nice one. It is close to Bairro Alto (a district with a lot of restaurants, bars, and so on) and close to the center of Lisbon. The apartment itself is very clean. You have to share the bathroom with other guests but that worked well. At night it might be a bit loud on the streets. Teresa (she was there for the check-in and all the other questions) was super lovely and reachable at any time.
Thanks for the nice stay. We highly recommend this place!