We loved the Sirkecikonak hotel. It is a lovely Turkish four star hotel. We stayed in the highest level rooms and they were 1/3 the price of the Ritz and the service and rooms were just as good. The location is wonderful. At first, we were taken aback as its front is on a funky back street, but it's back overlooks a gorgeous park and it is walking distance to almost all of the major tourist sites. A subway is close by and the included breakfast is great. The rooftop restaurant is excellent and has views of the Bosphorous. We've since recommended it to others who also felt the same way about it. An afternoon tea was included. When we went, airport pickup was also included. For longer stays, they offered cooking classes to guests. Every night, they left a gift on the bed. We had a huge balcony as well. It had a B&b feel and the management were incredibly helpful.

On the other side of town, near the Swisshotel and Intercontintal, is the Ritz Carlton. It was tops in service and amenities. I wasn't happy with its location even though most of the best hotels, except the Four Seasons,are there. It took ages to go back and forth to the sights as traffic is horrendous.

Hope this helps.