I stayed in this apartment for about 5 weeks and worked from there, and would definitely do it again. The apartment has everything that you need: kitchen is well equipped, AC was great when the temperatures started rising, the bed is comfortable. There are plenty of places to set up your home office (the dining table, small table in the kitchen and even in the bedroom), so my partner and I could both work easily. Oscar and Susana made sure the wifi was upgraded so we could work. Only downside is that the bathroom is in the big bedroom, so if you are with more people it could be a bit uncomfortable. Also, at times it was quite noisy due to construction work of the neighbors. That's something Oscar and Susana couldn't do anything about.
The apartment is in Poble Sec, close to the metro. There are plenty of cool restaurants, tapas bars and coffee places around the corner. The hip Sant Antoni neighborhood is just a 5 minute walk. Having Montjuic parc closeby and being able to escape the crowds was great. The city center and beach are also easy to reach, by foot or public transport. I had a bike for a couple of week (check out Kleta bikes!). That made my stay even more enjoyable.