I stayed in the Sagrada room for 3 months. The apartment is very central, everything you need is around the corner. It's awesome for students. Especially the kitchen and terrace are great for hanging out with flatmates.
Sagrada room is spacious, has a big closet and a desk that you can use to work / study.
But it's quite noisy at night because of the busy street full of bars and cafes. If you are a light sleeper you should consider taking another room or using ear plugs.
Jörg is extremely helpful, he quickly finds a good solution for small problems. I would definitely recommend the flat.