The apartment is in a great, central neighborhood to explore pretty much everything in Barcelona. Metro station close by, and most things were walkable in 15-20 minutes. Apartment was comfortable and had nice windows that looked out onto a courtyard surrounded by apartment buildings. The building is on a busy street, but this apartment faces the inner courtyard so you don't hear the road noise so much. Hearing loud noise from neighbor's parties or 70's music night at a local bar, on the other hand, happened several times.
We enjoyed our stay in the apartment, but there were some negative things about it. We found that the hosts weren't super thoughtful about how to make our stay pleasant. It seems like they are doing the basics, but not doing much beyond that. For example, the kitchen is not equipped very well as it's missing several items that would make it more functional (e.g. non-bent knives, a mixing bowl, pans that weren't peeling Teflon). They advertise a washer, but don't provide any washing soap, so we had to go buy a bottle of it. They ask that you to take out the trash each night, but didn't provide any extra trash bags for our 2-week stay so we had to buy them. We had to restock toilet paper several times during our stay as well as they only provided a couple rolls for our family. Several lightbulbs were missing, the front of the Ikea dressers were coming off, and there is wear and tear visible on the apartment throughout. It was clean, but it seems like there isn't much maintenance going on.
The troubling thing is that we wrote the hosts to ask them to address some of these issues (the kitchen supplies, missing lightbulbs) and they kind of brushed us off. They said they would "discuss it" and get back to us but then never responded again. We stayed for 2 weeks, so we had hoped for a responsive host.