I came to the apartment of this company, "Keys'n'Fly Team", and the keys were simply not there as instructed. There was another couple, with a baby, not far away, locked outside their apartment for the very same reason (and the host there was, again, "Keys'n'Fly Team"). There was not response from the host either thru the website, or thru phone (an answering machine replied). After an hour or so a woman came, apologising, said she has to clean both apartments, and sent me away for an hour.
The apartment was not clean, and I guess the sheets were not changed. There was not enough toilet paper, and the kitchenware was all dirty. The two single beds had to be adjacent. Very bad experience, overall.