The apartment is excellent, with multiple rooms with good beds. The kitchen has all the things you need to cook your own meals or just to have breakfast. The apartment has two different metro lines (L3 and L4) within walking distance, and Park Guell is also reacheable (although it is a rather steep uphill climb near the end). The water in the apartment doesn't get really hot, but I'm sure Rosa would've fixed this if we had let her know, and it wasn't a big problem anyway as there is a dishwasher and a washer. The Internet router is a bit finicky, but if you reconnect to it it works again and the bandwidth is quite high (over 8 Mb/s). The apartment has good locks and can be secured well, but it also has a nice balcony. It also has a secure parking lot in the basement, although the entry ramp is a bit steep (however, the tenants are fine helping with the car if needed).
We had a very enjoyable stay and would definitely use this apartment again the next time we visit Barcelona.