The apartment is perfectly clean, well located near a metro station ( U4), and really Beautiful. To access the apartment you need to install the Nuki app wich open the doors using bluetooth. When we arrived we couldn’t open the main door because we were not able to receive the signal from outside the building. We called Andreas and he opened the door immediately. We were able to use it when we were inside the apartment because we receive signal, but not when we were outside, so during the stay we had to used the spare keys of the apartment. I don’t know if it is our phone ( we have both Iphones with my GF ) who are not powerfull enough to receive the bluetooth signal from outside, or if it is the device that is not powerfull enough. It doesn’t prevent us from having a lovely week end !