Askeli is the largest beach along the island with crystal clear waters and sandy beach for the most part. It is organized and you will find many types of restaurants, cafes and water sports.
There is a bus that can take you directly to Poros town as well as many taxis. If you are in the mood for walking you will need about 25 to 30 minutes.
Villa Leta is just 250 meters away from the beach and at a very short distance you will find a bakery, supermarket and motorbikes and bicycles for rent.