My family and I had a wonderful time in Barcelona and this apartment was perfect for us.
Some of the reviews I read said that it was smaller than they expected, but it's actually a very good size for a European apartment. My family of 5 had plenty of room for the week. There are two ac units, one in the living room and one for the hall way, which we really appreciated since it was pretty hot the week we were there. You do have to leave the bedroom doors open to get air to the rooms.
The location is fantastic, there are tons of cafes and a few grocery stores within walking distance, it's also very easy to catch a cab from the area. La Sagrada Familia is very close and visible from the balcony. Pro tip: if you want to go inside la Sagrada Familia you have to buy tickets online well in advance. We bought our tickets on Sunday when we arrived and according to the website the earliest tickets we for Friday at 5:15. However after buying the tickets, we realized they were for Saturday at 7:15, luckily that was our last day in town.
Hans and Allen were great hosts, Allen met us and told us everything we needed to know about the apartment and the area. Hans even helped us schedule a ride to the airport when we left.
I would definitely stay here again.