We had a very good time in Christos' appartment. The appartment is very nice, well decorated, full FULL equiped and calm : we felt like home ! :) The place is very well situated (2 minuts of a wonderfull beach and 5 minuts of the centre of Livadi).
Christos is very caring about his guests and that's very cool. He also gives a lot of recommandations for restaurants and place to see on the island.
If you want to spend holidays on serifos, it's THE place to stay ! :)