The flat and furniture is nice, but the area was very loud; planes every few minutes, construction site, waste collection cars etc. in front of the building. We had to close the windows, but then the apartment became extremely stuffy (there is no AC) and we couldn't really sleep, so we had to leave the apartment after 1 night.
The host is not 1 person, but an organisation (Warm Rental), and during our stay I talked to 4 different people. When I told them about our sleeping issues, all I was told was that they're "not responsible for what happens outside of the flat" and that I repored the issues "after more than 24 hours after check-in" (i wrote them about 26 hours after check-in), which was apparently too late.
I asked them for a partial refund, especially if they rent the apartment out again, but they just told me to cancel the stay and that there will be "cancellation penalties".
If I won't get any more money back from them, I paid 1200€ for one night in which me and my friend could barely sleep. I agree that they're not responsible for the noise outside, but they are responsible for not having installed an AC and for the lack of empathy.