Hi,
I haven't stayed there, but if you have any (even slight) mobility problems, don't go to the Grand Iskandil. Its built up a hill (a very steep hill) and the main reception is right at the top of it. There are many many steps within the hotel area, to the rooms and pool.
It is in a great central location for the resort, but again, you've got the hill to climb up whenever you want to get back in your hotel.
Elaine