I went to Barcelona with 4 of my friends.
We got to the apartment and the hosts friend was there waiting for us. She was friendly and explained us where the main sights were. They even prepared us a snack and a bottle of wine. That was nice.
The location is really good, the metro station is right next to the apartment, grocery store and some restaurants are also near.
At the evening we find out there was no warm water (it only came every now and then for a minute), so we showered in cold water. Next day I told Enrique about the problem and somebody came to fix it (when we were in the city). But it wasn't fixed - still no warm water at the evening, cold shower again - until we went home (we stayed for 3 nights).
We even got a little flood- it was raining and the rain was leaking through the window right on the microwave and toaster.
The apartment should be cleaner (dust, cleaner bathroom, dishes..).
If you fix those things and clean it a little bit more, it's really good apartment, big and spacious, and great location of course.