My wife and I enjoyed our stay at Klaus' place. Perfect size for a couple. The apartment has a nice kitchen to prepare meals in the event you are not out and about. Located near tons of cool local restaurants and bars and still within walking distance to most famous tourist spots. There is also a metro stop very close by. Be aware that there are a couple of flights of stairs to the apartment which was no problem for us as our apartment at home has the same feature but this could be an issue for people who are not used to stairs. We would definitely stay at Klaus' place again if we return to Barcelona.