The landlord was nice to give a better price when we at the beginning made a wrong reservation by changing to 6 person instead of 1 even though we set 6 people as criteria when making the sourcing. I think Airbnb should do some improvement on the system. To be honest, the original price for 6 is not economic and we would not choose that apartment if we realized the price shown is for one. The customer service of Airbnb was quite helpful in coordinating the case.
The check in was successful and the apartment is neat and well located. But we made some trouble by put the key to the wrong building. We were asked for compensation which is understandable. But by then the locksmith was not on site to repair and we questioned whether the price was too high and reasonable(we asked for the breakdown of the cost) and the landlord never respond and assisted since then.
By the way, the sound insulation of the building is quite poor. We felt sleeping in the street on the first 2 nights and later were used to that (we were too tired). I don’t think it is a general problem of an apartment in the city center as we lived in an apartment in Madrid just beside the Madrid Palace and it is very quiet.