The location in Ortakoy is ideal for those looking for fun in neighbourhood since it is situated near main night life places in Istanbul.
Hotel is clean, rooms are not so spacious as expected, but it is pretty much the same in all hotels from this chain. Hotel has wonderful view to Bosporus and the atmosphere is great.
The service is great. They arrange us all the reservations in main restaurants and also a guide tour around the city that I warmly recommend. This is the most efficient way to see the city.

Modern hotel, Scandinavian style and a bit on the small side but clean and modern rooms, with free wifi. Good pricing and right next to the much more expensive Four Seasons. Restaurant and bar have stunning views across the Bosphorous and the most fabulous breakfast right on the seaside. Great location with many cages nearby and lovely walks by the shops and seaside. Friendly staff and an overall great hotel!

The location of this hotel, right on the Bosphorus in Ortaköy, is its trump card. The terrace and more expensive rooms have a fabulous view across to Asia, only marred (or made, if that is your taste) by the proximity of the modern bridge. Ortaköy is actually quite a charming little suburb, with good shops and cafés. The hotel is as comfortable and well-appointed as the prices would lead you to expect. No complaints at all on that front. Stylish rooms, professional welcome, etc. Ideal for a short stay if you want to be in this area (as I did), and if you can put up with the hotel being inside a sort of public car park (of which many rooms have a privileged view). But what spoiled my otherwise excellent stay was the noise. It is right next to a mosque, and to a little street of cafés whose patrons seem to be surprisingly vociferous at busy times. Even with the windows closed I found it impossible to shut out the noise. And finally, as others have remarked, this is not a good base from which to explore the central parts of Istanbul. The traffic jams, particularly in the vicinity of the Besiktas stadium, are notorious, and what ought to be a ten-minute journey in a bus or taxi could end up taking an hour or more.

This was my first stay at a Radisson Blu. It is their attempt at a W style hotel design. It was nicely done with a clean and contemporary feel. I liked the free wifi. The breakfast spread had the largest selections of food and Turkish delights that I have ever seen. Very impressive.

It's best attribute is the location. It's right on the Bosporus Straight with awesome views of the water and the Asian side of Istanbul. Plus it's in a neighborhood with several restaurants and night clubs right next door. The best sushi spot in the city is Zuma, which is in the hotel.

The first room we got was in Tower B facing the Bosporus Straight. While the view was great, we learned that the nightclub below our room plays very loud music until the very early hours of the morning. We requested a room change and received one in Tower A which gave us a view of the water and protection from the nightclub music.