1. Not abundant breakfast, most of the things were not fresh.
2. The receptionist who welcomed us at arrival (early in the morning 12th Sept) was arrogant and sarcastic when we he was replying negatively to our suggestion of letting us have breakfast before checkin, considering that our checkout was expected at night 4 days later, and we would not have possibility for our last normal (paid) breakfast. When we complained to other hotel staff about this situation (and, surprisingly, we found their understanding, which we appreciate), this receptionist stopped being polite to us.
3. At checkout we were offered breakfast (hotel policy actually allows early breakfasts at request, which we obviously asked for, having in mind the mentioned above situation and not wanting to lose our money), which consisted, per person, of 2 dry slices of bread, 1 cold egg, 2 slices of cheese, 2 slices of ham and a coffee (without being asked if I would prefer tea instead). As it was the same receptionist, we had to spend these few minutes close to this speechless and impolite staff member.
Clean rooms, transport to and from the Mykonos airport available with no extra cost, close to a bus station, staff of the hotel (apart from one, as described in "-").