A good Airbnb. Very small (the bedroom is essentially in the hall) but very centrally-located.
As others have noted, it's located on a quiet street. The half of the street it's on doesn't have any bars or restaurants currently, so it's reasonably quiet in the bedroom if you close the living room door and have earplugs. The living room does have a pull-out sofa bed, but I imagine it would be noisier sleeping in there (unfortunately, this is where the air con is). The main noise issue is from the people in the Airbnb apartment above as there's little insulation between the floors (common in Portuguese apartments).
Other issues include the fact the sofa is quite dirty (others have mentioned this) and the fact the electricity cuts out of you try to use the fan-assisted oven. A blackout shutter for the kitchen would also help (also mentioned in other reviews). Access to a hoover for longer-term stays would be useful too.
Otherwise, the apartment is nicely-decorated, clean (aside from the sofa), and has a good shower. It is small, so it's better-suited for short-term stays but could be okay for one-person slightly longer stays as well. Jorge and Angélica were very quick to reply to messages too.