The flat itself was great. It is furnished very stylish and has a great ceiling and nice balcony in the bedroom.
The disatvantage was that the house is not at all soundproof. We heard the neighbours talking, the elevator (mainly in the living room) since there is a window to the side of the elevator and we could feel the metro.
Besides of this our stay was great and I think that this is what you have to accept staying so central. The appartment is located perfectly. You can walk everywhere. We did not even use the metro at all and walked to Park Güell and the W hotel, too.
Julia is a good host who offered all her help. Thank you so much!