The flat is perfectly located. You can reach all the sights and the city centre on foot. And yet you are a bit out of the way and don't hear any noise from the street.
Check-in is contactless via app and you also need the app (with internet) to open the door. My friend doesn't have internet abroad and the wifi doesn't reach the door. Luckily I was able to open the door with my mobile phone. But if you don't have internet either, this flat is not for you.