I enjoyed staying at this place. The apartment is very cozy and the pictures match the actual place, it has its own old Lisbon charm. Bathroom was small but very nice, great shower and high-quality towels provided.
The location is very central and convenient, it's great to be near everything in downtown Lisbon. However, because it is in Bairro Alto, famous for its bars and nightlife, it can get quite noisy at night. Closing the windows can help.
The negative thing for me was the mattress on the bed... it was way too hard for me and I woke up feeling physically tense and stiff as a result of that, especially after several days sleeping there.
If you like hard beds, go ahead. If you are like me and prefer something softer, better ask the host first, as I should've done.