We used this apartment as a base for a 5 day break in Barcelona for our family of 4 (2 adults, 2 teenagers). It is in a good location for exploring the city. It is within walking distance from the Aerobus stops (check the closest, we walked further than we needed to on arrival!). There are a good selection of shops, cafes and restaurants in the local area, including some reasonable sized supermarkets and the Sant Antoni market for good fresh produce. Metro stations are close enough to walk to, as are both Plaza Espana and Plaza Catalunya.
The apartment is quite small, so would be a squeeze for 5 adults. There is one tiny bathroom, a fully equipped kitchen for doing your own cooking, although it is very small, only room for one person in there at a time.
It is in on the first floor and on a fairly busy road so there is a good deal of traffic noise when the windows are open. The single bedroom facing the road was noisy with a lot of light coming in on the first night, we resolved this by closing the shutters as well as the curtains on subsequent nights.
We were rather disappointed by the outside area and so did not use it, it is overlooked on 3 sides by the remainder of the apartment block, many balconies, most with laundry airing, it has no morning or evening sunshine which is when we would have been most likely to use it.
Checking in and out was simple.There were a couple of maintenance issues which the host responded to promptly.
Overall we enjoyed our stay here.