I stayed in Vincent's apartment for 5 nights with 4 other friends. First, I will start by mentioning the good things:
The space of the apartment is very well distributed. All five of us were very comfortable. Three sets of keys were provided to us, which made it a whole lot easier for us to leave and come back as we pleased. The facilities inside are all new. With the exception of a chef's knife, we found everything we needed in the kitchen. The private terrace at the top was also a big plus.
Now for the things that we didn't like or would recommend changing:
Vincent, the host, has a huge temper. We were shocked by his unfriendly welcoming. He was angry at us for arriving late, not having told him of our delay prior to arriving and for an incomplete arrival group. According to him, because of our fault, other tenants had had to wait for him to open other apartments. We think we didn't seriously influence any of his other bookings; he was just angry we made him wait. Which we understand as a reason to be bothered, but he could have been nice about it. Lucky for us, the rest of the people we met in Barcelona were not as rude as he was.
Other than the host, we weren't very happy with the drainage of the bathroom in the living room. After every time we showered, the floor had to be mopped.
We also had problems with the electricity one of the mornings. Seems like there was an overload of some sort, that cut the power for half of the apartment. We solved the problem by resetting a switch in the electricity box, as instructed by Vincent.
Last thing we disliked, and this is not really a problem of the apartment itself, was the construction work that took place every morning from 8 am. This was very loud and annoying.
Overall, we were quite happy with our stay. The apartment is well maintained and well located. Too bad the host is not very polite.