Check-in process and opening doors using a cellphone app was not very easy or trustful. At the second day of stay the main entrance door stopped working via the app. We had to call emergency number as 01:00 am and wait around 30 minutes outside for someone to manually open the door.
The apartment needs some maintenance or at least a more careful verification before guests arrive. When we got to the apartment (at night), none of the lights were working (bedroom, kitchen and bathroom) and internet were also not working. We called then and they said they were going to send someone next day in the morning. Nobody appeared or replied my messages until 13:00 when I decided to personally go to their office to ask for a solution. They did send someone to the apartment and problems were fixed around 16:00.
Apartment has a great location. You can basically do everything by walking. Bars, restaurants, supermarkets, metro stations, touristic attractions, everything nearby.