Overall I would describe it as nice but basic.The apartment is located in a nice and high-end area of Barcelona. It is not central to the touristic areas of the city, but within walking / metro distance or a 5 -10 EUR taxi ride. We didn't have any issues with that. The apartment was clean and we didn't have any issues, but you should be aware that it is one of those "basic" Airbnbs that work well for sleeping, but not if you are planning to cook and give it more of a "home" use.
The only issue we had was a message from the host after we had left the apartmetn asking "why had we use the items that we were not allowed to, and how many people slept in the apartment and where", which was ridiculous and not pleasant both because of its accusatory tone and inaccuracy - we didn't touch anything we were not supposed to and used the apartment only for sleeping, and my 60 year old parents and wife stayed there - well within what was allowed in the listing for for a two bedroom apartment!