I've stayed there the last two years. Sleeping-wise they're rudimentary, especially if you pack the apartments with four people. But they have a basic kitchen, a balcony and - this is crucial - highly effective air conditioning. You also get access to a pool if you can't be bothered to go to the beach and you're within walking/stumbling distance from all the Ibiza Town bars. And the walk back from Pacha in the morning's pretty cool. I may well book them again this year as they're so convenient.
