This apartment is wonderful! We were 4 people and all felt perfectly accommodated. The layout is such that no one's private space interferes with anyone else's. And the bathroom is far enough from all other areas that you don't have to feel self-conscious about using it.
The common areas are cozy, the whole place is sunny and lovely. It is perfectly outfitted to stay in and cook your own dinner, if you want. Close to everything, and the immediate neighbourhood is very lively. Apparently the month of June is when they have regular Saturday parties in one of the nearby alleyways.
Also, there is a great Pharmacy and Healthcare Museum near the Catarina lookout. Highly recommend!
Basically, we felt perfectly at home here, which is so important and elusive when you're travelling. We loved it and I would definitely stay here again!