Stayed in the Orvay before and enjoyed it. Our apartment had a large sitting room / diner area and a seperate bedroom which was cool. We had decent cooking facilities and the all important fridge!!!!
The pool area is small but the fact it is on the roof is cool as you get the sun all day and the close proximity to the Ibiza Rocks! hotel means there is a soundtrack during the day too!
Most places in San An / West end serve typical British fayre (everything with chips!) for around €6. In the bars expect to pay around €3 a pint of beer and €6 for a pint of vodka + mixer.
My money saving tips are in this