Although half of Istanbul is located in Asia, good Asian restaurants are very rare and most of the time overpriced. Luckily there are some nice restaurants to enjoy some old-school Thai, Japanese and Chinese food.
Pera Thai
Mesrutiyet Cd. 74/A, Pera
Some basic but nice Thai food in a cute little restaurant in the Pera neighbourhood.
Shang Palace
Shangri-La Hotel, Hayrettin Iskelesi Sk. 1, Besiktas
Authentic and chic Chinese restaurant in the newly opened Shangri-La hotel in Besiktas.
Maromi
Divan Hotel, Asker Ocagi Cd. 1, Taksim
If you are looking for a restaurant where a traditional Japanese Kaiseki dinner is served, then this is the place to be.
Itsumi
Suada, Kurucesme, or Is Bankasi Tower 2, 4. Levent
This is the one and only joint where the Japanese expat community enjoys their sushi. For a nice atmosphere and view, go to Itsumi on Suada.
Udonya
Point Hotel, Topcu Cd. 2, Taksim
Not a very well-known Japanese restaurant, but the quality is great and the prices are likewise.