We arrived 2 minutes late for the checkin because our flight was 80 minutes delayed, fortunately the concierge waited for us and give us the key to the apartment, which we really appreciate. Unfortunately, this is where all the good stuff ended.
The apartment is nice and well-equipped, but doesn't have a proper door. It is just a sliding door with a gap between the door and the wall. So, if the guests in the apartment downstairs (it is owned by the same host and has a door right next to this door) watch the TV, you can hear it. If they smoke until 3am in the morning, you can feel the smell until 3am in the morning - and that was our case. For 2 days and nights (half of our stay), the guests were smoking there and the smell was coming to our room. I complained to the concierge, directly to the guests (who admitted it), to the host and in the end also to Airbnb support, but nothing helped.
The concierge was mostly giving excuses ("maybe it's from the terrace" - no it's not, "you also broke a rule by coming late" - yes, it was 2 minutes, or "maybe you would understand if you knew they came for work, not for tourism" - no I wouldn’t).
The host said sorry but once I asked about a partial refund, they denied that somebody smoke there and refused to give me a refund. But how can I prove that? There is no way to make a photo of smell. I don't think the host ever came to check it personally - if they did, they would feel it too.
I can imagine that 98% of the time, you will have nice neighbours and your stay in this apartment will be nice and smooth. But be aware that if something bad happens, the host may not help you at all and will even deny the problem.