We enjoyed the time in Lisbon and at Paulos apartment very much. It's a really nice and clean studio with everything you need for your stay. Moreover there is a supermarket just around the corner and a tram station right in front of the house. If the tram was too crowded, it was no problem to walk to our destinations.
Unfortunately we haven't met Paulo in person but nevertheless he was always reachable and very helpful.
When visiting Lisbon, we would again choose his apartment.