not hilly at all from Arya, straight road into town. Haven't stayed there though unforunately.
The Iguana apartments are central right in the square, couple of mins walk to the beach.
The Ozlem apartments are on the main Tansas road just up from the square and cash machines only another couple of minutes away.
The Selen is also very central, a few minutes walk up from the canal - there is no pool, you have to use the facilities at the hotel across the road.
Can't help with the Mandarin sorry, but as BlondieScot mentioned the Ekinci Palace is on the outskirts of the resort at the back of the old village. Quite a walk but there are frequent dolmuses in town.