One of the best places I've stayed in so far. It's an apartment with five individual rooms, all quite spacious except for one. The rooms, the kitchen, the bathroom were all impecable and comfortable. Locks are electronic so you don't need a key.
It felt really private, but then, there was only one other guest staying with me in the apt. It may change if it's full.
Mario was very friendly and helpful, really pleasant.
Location's very near the metro, some main sights and relatively near to night life.
Definitely recommended.