We have stayed at the swissotel in istanbul (a great rate after 9/11). It is wonderful, but very pricey unless you find a deal.
Last trip, we stayed at the Hilton parkSA. Just down the street from the swissotel. Not nearly as fancy, but I was very pleasantly surprised. Excellent lounge for gold and diamond members. Cheap price. Very comfortable room. Nice staff. Would definitely stay there again.