The apartment is really well situated in Sant Gervasi neighborhood - it is 2 mins away from the El Putxet (L7) train station that gets you to Placa Catalunya in 10 mins - and you have 4-5 good restaurants in 2-min walk radius. There is also a Supermarket pretty close, working from 8:00 to 23:00.
The 4 bedrooms are kinda small but can do the job.
Some of my colleagues said it is kinda noisy, which is understandable considering it is on the first floor; right below it (under the living room and the bedroom next to it) there are restaurant with outside tables (3 Voltes and Fujiyama) which are good places to eat, but also host guests until 1AM, which may be disturbing for people who want to sleep and are noise-conscious.
The living room is good size and can be used for Internet work; the dining room is good size, it is well equipped and has everything but dishwasher. The two bathrooms are good size and quality, but the water current is not enough to use both showers at the same time.
I would rate my experience as quite good, and my biggest complain is the internet connection, which was not suitable for our business needs. It was ok for casual browsing but not for business work - 8/0.8Mbps upload/download. If you try to upload something, it stops the connections.