We stayed at Petros' place in late September and it was the best choice we could make.
Petros provided us with two bikes, which we rode every morning to the nearest Tigaki beach. The appartment has a great location in a calm and quiet neighborhood, however it is only 3 minutes from the bus stop on the main Kos road.
When we will visit Kos again, Petros' place will be a clear choice. :)