The location of this place was great! Quiet neighborhood to relax in after spending a day in the city. We could walk or take the metro/bus/tram to most places we wanted to visit. The apartment is a good size, it was plenty big for my friend and I. Plus, we felt secure with three locked doors between us and outside. We were greeted with a bottle of wine, coffee, and a snack which was much appreciated after traveling.
You do hear the tram and some cars go by but we did not think it was too loud and the bedroom is furthest from the windows (so we did not hear much at night). They provide dehumidifiers which can help with the fact that it is a basement apartment with little ventilation (we were unable to open the two small windows but this could have been our own user error, be sure to ask how to open the windows during check in).
Overall we would recommend this place for a long weekend in Lisbon!