We were a group of 6 guys and we really enjoyed our stay at the appartment. It was spacious enough for 6 people with 6 beds in 3 bedrooms and two bathrooms/toilets.
The location is perfect, as it is right in Bairo Alto where all the hip bars and restaurants are. We didn't hear anything at night when sleeping, as it is located in a street with no bars.
We definitaley want to return to Lissabon some day, thank you for having us!