This is a relatively large space, at least by Barcelona standards I think, and the shared spaces are pretty spacious. If you stay during the week like I did, especially during the off-season, and for a long time, you may even have the whole place to yourself for stretches at a time. A big thing for me is laundry (lol, weird, I know), and he has a machine in the back along with a quant clothesline hanging outside the window (As well as a drying table inside).
The bathroom is big. The location is perfect for anyone who wants to hang out in El Born (and is also a very quick metro trip to the deeper parts of Eixample; technically I believe this flat is located on the border of El Born and Eixample).
Xavier has a person come in to clean and set up the rooms, and when you enter you'll see towels and blankets made up for you, prepared and folded hotel-style.
I will say this: if you are very sensitive to noise and require silence, noise from other rooms does travel here. Fortunately, they provide ear plugs. But, for the rest of us who aren't bothered so much by this, this is just fine. I would like to stay here again.