My stay at Mandarin Oriental Istanbul was a mixed bag of good and bad. I will start with good: property is well kept and has great location, staff is polite, property has few good dinning options. However, there are significant issues that must be fixed to earn 5 stars. First of all when I booked my stay reservation offered free upgrade. Upon arrival there were rooms for upgrade but for extra charge. Classic bait and switch. Second of all, I was not allowed as a hotel guest to eat in Novikov although the place was empty and had plenty of seats available. Restaurant made me order deserts and sent to my room instead. Inconvenient to say the least when you try to have a good time and willing to spend money for it. Hope management takes necessary steps to handle the ongoing issues with the hotel.