If you're traveling to Lisboa for a couple of days alone or with a +1, this is a OK place to stay. Nothing fancy, just something that is comfortable and works for a short visit. Although I'd recommend to consider the below comments.
The pros:
. Location.
. Walking distance to nearby attractions, bars and restaurants.
. Comfortable bed.
. Communication with the host and his assistant.
The cons:
. Check-in process: we were told by the host that we had to reach out to someone else via WhatsApp in order to check-into the apartment (although we requested self check-in beforehand).
. Even though we arrived after the pre-arranged time, the apartment was still being cleaned, which slightly delayed our check-in.
. The electronic lock didn't work and we could only use a key stored in a door-side locker, which we couldn't take away from the building. We were told the e-lock would be fixed, but that never happened.
. Be aware that there's a steep and narrow staircase to access the apartment. Not ideal when carrying two 23 kg suitcases.
. The place can be noisy at night, with noise from the staircase and from other apartments (not necessarily from the street).
Overall, it's a good place for a couple of days in Lisboa.