Just got back from Corfu 2 days ago. We were staying in Ag. Stephanos [NE].
Booked a trip to Ericoussa from Value Plus [15 Euros each] in Sidari. Trips go out on Sundays and Wednesdays.
Departed from the small jetty in Sidari at 10am. Crossing by boat took just under one hour.
Had a great day on Ericoussa. Not much there really but it's quiet and peaceful. There are a couple of snack bars and a hotel, where drinks, snacks and meals can be obtained. Lovely beach - sandy - with sunbeds and umbrellas for hire [2 beds, 1 brolly cost 4 euros in total]. Sea is crystal clear - sandy bottom, so no jellies required and very very gently sloping...needed to wade out quite a bit before we could swim.
Had to be back at the boat for 3pm and arrived back in Sidari just after 4pm. All in all - a lovely day. We would certainly recommend it.