We had the best time staying at Mercedes's apartment.
Very good location and authentic apartment especially for young people as there are many steps which for us was no problem.
Mercedes is a great host, the breakfast was very practical and she made us tasty drinks in the evening. Also she had great suggestions how to spend time in Barcelona.
Would have been nice to mention the cats living there. Also the shared kitchen wasn' t completely clean.
Apart from that we would love to come back one day!