First of all, the Apartment is located in one of the best, alternative districts of Madrid with many Bars, Restaurants and small Shops nearby. The Major sights are also reachable without depending on public Transport etc.
The Apartment itself can easily accomodate 3 People as it has 1 big bed in a separate bedroom and a Couch in The living room. The kitchen is fully equipped.
In summary, it is a great Place If you stay for a few days only.