Avoid San Antonio at all costs! Unless you are a teenage beer & tequila drinker. It's a cheap shit-hole off a place overrun with British teenagers (I should know, I used to be one of them). Ibiza has sooo much more to offer.
And I'd also avoid August if you can.
There are a million apartments just like this you should look into.
https://www.facebook.com/IbizaApartmentBotafoch?fref=ts