Nice apartment, although not top of the line. A very good deal for the price.
There is a ton of space with three bedrooms and a large living room. The air conditioning works very well, but one of the big bedrooms doesn't have any air conditioning! The beds are comfortable but cheap—a thin mattress over wooden slats. There is great natural light, and the windows open up full-length. Be advised that it can get noisy, since this is only one story up and is immediately above some restaurants and bars.
Check in was easy, and the team was very good at keeping in touch with us. Everyone we communicated with was very helpful and friendly. However, they do charge a 30 euro fee if you need to check in late.
Overall, a very nice stay in Barcelona and a good deal for the price.