We were 5 people who stayed in the apartment. The way to get there is very steep, so with a big suitcase it will be really hard climb up the hill ;)
The apartment was really big and very clean, everything is new and there is a lot of space (in Lisbon this is not so common, so we were very happy).
There were only 2 points that were not so good: there was no WIFI in the living room and the small bedroom next to it. An the beds were very hard and it was not so comfortible to sleep there.
But everything else was very nice! In the kitchen there were some cakes, fruits and bottles of water for us. There was also a coffee machine. The lady who welcomed us was very nice and sent us suggestions for activites in Lisbon every day.
All in all I can really recommend this Apartment :)