We used ueber taxi services and when i asked the driver which did not know of the restaurant check on tripadvisor and got the number he called them and since there are two radisson blu hotels in istanbul the driver did not specify which radisson blu and the restaurant gave him the address of the restaurant branch at the olivium mall which is about 5 to 6 km away instead of the closest one to the hotel so be careful of that people when you do visit this restaurant. Now the restaurant itself is not great neither food wise neither as a general.place to have a nice lunch or dinner maybe its the branch i went to not sure, ended up paying 86 TL for soup, salad, small meat pan and the turkish dought i dont know all the names of the dishes but the pictures will tell you and the menu.