A very nice appartment, quite small but very well arranged. Big windows, and a small balcony, perfect to enjoy a really beautiful view of the city and the Sagrada familia.
The neighbourhood is very nice as well, a little bit in altitude, very close to park Güell, and very quiet. However, it requires quite a lot of hiking (so people with limited mobility beware, especially because there is no elevator). It is quite far (10-15 minutes) from the metro, and you have to hike up and down a lot, the streets are quite steep (but it is also the charm of the nieghbourhood). You have to walk a little bit to get to restaurants and bars, but that it also the price of a peaceful environment, and was not a problem for us.
Finally, we stayed for quite some time, looking for a permanent appartment in Barcelona, and it is really not equiped for stays longer than a week. There was no extra sheets (and after a whole week of exchange, they only offered sheets for 20€), and nothing to clean the apartment