I'd like to thank Fei and his mom very much -- they are so nice people, so helpful! Thanks to their tips we visited the most beautiful places during our stay in Catalonia.
If it comes to Fei's apartment: it's very clean and spacious, well located. Although there is no kitchen there was no problem to borrow some plates and knifes from Fei's mom who's living downstairs.
I can strongly recommend you this apartment.
Thanks guys!