There are not that many complexs on the beach at Calis, there is Seaside & Sunset and a couple of other apartment blocks. Seaside & Sunset are both lovely complexs.
I would say Sunset is the furthest with a 20/25 min walk to the centre, Seaside is about 10/15 min walk to the centre say the Nil bar but there are lots of bars and restaurants along the way so it is not like you have to walk 20 mins until you reach somewhere. Also at that end of the beach you have Guvens, The Surf Club & the Sunset facilities. The dolmus stops right by Seaside, don't think it goes to Sunset yet.