I can definitely recommend Mario's place. It's a great option for sharing and traveling on a budget.
The apartment is situated a few minutes away from the city centre. There's also a metro station just around the corner.
The apartment is lovely. Very clean and spacious. The kitchen is well equipped, the living room is big and the bathroom was very clean. When we arrived the beds were freshly changed and fluffy white towels were waiting for us.
Mario has ben a great host, he helped us with recommendations and tips about the city.
All in all, a great choice. Good value for money.