I can say that Ricardo is the best host you could ask for. He was very nice to us, he waited for us to arrive in the middle of the night, helped us with resturants, parties and clubs. Also the location is perfect. Almost everything you need to see in Barcelona is very close (except Barcelonetta). You also do not need to worrry about your deposits, they are safe and if everything is okay, he will return them to you. But everything has good and a bad side. First, the apartment doesn't look like on the pictures. You have one huge bedroom with double bed and 3 single beds, (you cant find that on the pictures), and then three very small, no window, no ventilation bedrooms, two of them can only fit one bed and one - double bed. Also the last problem we had was that the apartment didn't look like it was cleant well.
The overall experience was good.