We went to the Zante Star last year, and I can safely say it was the best place we've ever been to in Greece. The apartments are quite new, so are not as 'tatty' as alot of self catering places you find. The pool are bar area are lovely, and the food v. good. Can't help regarding map, but can say that these appartments are around a 10 min stroll from the main area of Tsilivi, and just 500 yards from the beach.
We will definately be going back, which will be a first for us, as we usually like to try out different islands / resorts.
PS. Tsilivi is a good resort, as it has a great selection of tavernas, bars etc, but still has some greek charm about it. Also very good for families.
Look at the excellent http://www.justzante.co.uk site for more info on the Zante Star, with reviews from others who have stayed.

Have you seen their website http://www.zantestar.gr