We had a very nice stay at Victor's apartment. First of all, the location is great, because it is located in the Gracia neighborhood, which is central and has a lot of nice restaurants and bars, but also because the street in which it is located is quite, so you can sleep well! The metro stop is 5-10 minutes walk, and you can visit a lot by going by feet (the sagrada familia, the guell park). There is also a bakery just down the building where we had breakfast every morning, and a supermarket across the street.
Regarding the apartment, it has a good size for 2 (I stayed there with my husband), with a nice kitchen/living room and a spacious bathroom with all facilities. There is also a nice small balcony. The bedroom is small but spacious enough for a couple.
Now the "negative points"! What I disliked was that there is not a "real window" in the bedroom, as it gives in a "hole/tunnel" in the center of the building, so that it is rather difficult to let fresh air in. Also, it was not perfectly clean (especially the bed sheets and the floor), but this was acceptable. We arrived at 11 pm and were welcomed by a friend of Victor, which arrived 10-15 minutes late and to whom we had to pay the extra 30 euros for late arrival.
In conclusion we would recommend this apartment for a short stay as ours (3-4 days), but there a small things to be improve!