Jose's apartment is lovely and he is a great host as well. He was always available by phone and he sent a text in the middle of our stay to see if we needed anything. We were able to drop our bags off early which was a great help. It was easy to find (the front entrance is to the left of the Subway sandwich shop) and there is a small elevator in the building if the 4 flights make you nervous. The apartment is exactly how it looks in the posting -- yes, Sagrada Familia is just across the street! The view is so amazing. It is also across the street from a metro stop and a corner where many taxis park, so getting around town is very easy. The general neighborhood is a touristy neighborhood that quiets down at night compared to other areas (el Born, el Gotic) but I actually appreciated that. We could hop on the metro to go where we wanted but when we got back to the apartment at night we could escape the crowds a bit. Definitely take advantage of the metro. It is color coded, making it easy to use. You can get a T-10 card that is good for ten uses anywhere in Zone 1 (main parts of the city) and I believe it is 7€.
There is also a coffee shop just down the street that sells very reasonably priced coffee and pastries. The cream filled croissant is really good :) If you are a light sleeper, you may want to bring earplugs. There are a lot of mopeds in the city and there is a decent amount of traffic on the street outside.
I definitely recommend Jose's apartment! I think it could be a great place for a family, or just couples/friends.