My brother, dad and I stayed at the apartment.
The communication with the host was very easy -when we arrived we were welcomed and got an explanation of the apartment details.
There were two set of keys, it was clean, cozy and very central to Lisbon.
Even though it was in the center of the city it was very silent and the only thing we could hear was the occasional tram passing by - but this was just charming.
We would really recommend it :)