The appartment was rather good. The written communication before the arrival was OK, too. Yet, we had an accident with the key and Marc (co-host) was VERY rude on that occasion - shouting and talking to me 'per Du' (in German, can't translate it in English) even though we have never met before. Despite being quite informal myself, I consider that tone and substance to be fully inappropriate and unprofessional. So, BE CAREFUL with the app keys, otherwise you'll be charged an additional 200 EUR! In the pre-arrival note, there is an information on one key being in the key box and the other waiting for you in the living room. Yet, in case you leave one key in the internal door lock, you won't be able to unlock the door (with the other key) when coming back to the app. That warning is only written on the door from the inside. But, we were in a rush just leaving our bags and some medicines in the fridge, and didn't read it. However, we do think that kind of warning should be written in the pre-arrival notification. Moreover, the key lock should be modernised in order to avoid that kind of unpleasant situations for the guests! We travel quite a lot bot for private and professional purposes and this had never happened to us before. The key locks should be user-friendly! Hope Osnat and Marc will sort it out in the future so that the guests are not forced to pay 196 EUR (10% discount for the cash payment included) to the external key service for the door to be unlocked.