We had a wonderful stay at Klepsydra. The concierges are all extremely helpful and friendly, and the room is beautiful and elegant - not to mention the rest of the building is beautifully finished to 5* hotel standard. There are lovely restaurants close by and it’s an extremely walkable distance into the main neighbourhoods of Monastiraki, Plaka and Psyri, and also not far from the Panepistimio metro station. If we are lucky enough to return to Athens we would definitely stay here again. Highly recommend!