Romanos was very helpful and reactive, calling a locksmith for us, as we left the flat with the key in the door inside and could neither lock nor come in again with the other key. Thanks again for your help!
The flat was a little further from the Acropolis than I expected -30 minutes walking for my 70-year-old parents- but the place itself was perfectly clean, with a lot of space and intimacy for each room, each bedroom having its own bathroom, and the kitchen was well equipped. Thank you!