This is a great base for exploring Lisbon everything is super walkable and you are near all the bars and restaurants!
I would be weary about the noise as you are right in the middle of bairro alto, it was especially loud on Saturday night- not idea for light sleepers.
Flat Is super clean and the beds comfy and good air con. It’s well prepped with kitchen equipment etc.
Overall would recommend for a few nights stay as a base to explore lisbon.