Had a recent F & F stay at the Radisson Blu Bosphorus that we really enjoyed.
Got free breakfest, and got upgraded to a huge duplex appartement despite the fact that I have no status with Carlson.
Every morning except sunday, you can take a seabus for a fun and inexpensive 25 minutes ride to Eminomu (close to all the tourist attractions).
You can catch the same seabus to go back to Ortakoy in early evening.