I've always stayed in PDB as prefer to be closer to Ibiza town as apart from the sunset bars in San An there's no reason or clubs for me to base myself in San An. We too like to be based somewhere a bit quieter with easy access to the livelier parts of town.
We've stayed at the Sirenis a few times, it's at the quiet end of PDB and only a 10 min walk up to bora bora etc. We upgrade to the premier room and add on half board and it was about the 1500 mark, that was for 11 nights July/August visit. Sure we were about the same price for 14 nights towards the end of august and into september, the staff there are friendly and helpful, the room was nice, the food was ok for a few nights but after that we get bored, not a fan of buffets anyway.
Lux Mar is away towards the Ibiza town end of Figuretas, our apartment was a decent size, separate bedroom and living area, balcony in the bedroom and a decent size terrace that was handy for getting the kit of and sprawling out sunbathing, views out to sea too. The food was shite though, should have guessed when it was only an extra £30 for the two weeks
. Would probably stay there again although it is a bit of a trek up to main area of PDB.
Jabaque as someone has already mentioned are good size apartments, in a quiet street, pool area is alright, bar by the pool too. Easy enough to get to PDB/bora bora by walking up the beach or beach side path, few eating places in that same street or head down to Figuretas promenade.
Stayed at another apartment directly across from Jabaque, the mistral apartments but that looked a bit closed up this year, no loungers by the pool etc. We could see lights on in the apartments, towels/clothes hanging over balconies so there are obviously people in residence, maybe it has turned residential rather than for holiday makers, was strange that there was no pool loungers and the pool area looked as if it wasn't being used. The rooms there were actually alright, good size although could have done with a bit of brightening up.
Playa Sol 1 also in the same street as Jabaque, stayed there for 3 nights and it was ok for a short stay but as I prefer something along the lines of a nicer room at the sirenis I probably wouldn't go back there. Having said that the rooms were clean, bright enough, air con that worked, fridge, balcony, towels every other day, would certainly do the trick if on a budget or short stay.