The Peninsula Istanbul has the stronger waterfront position and a more destination-resort feeling by the Bosphorus. Mandarin Oriental Bosphorus, Istanbul is also closer to the water and feels more resort-like. Raffles Istanbul answers with larger rooms, real terraces, Zorlu Center access and a strong spa.
Four Seasons Hotel Istanbul at Sultanahmet is the better choice for first-time visitors who want to wake up near the main historic monuments. Four Seasons Hotel Istanbul at the Bosphorus offers a classic waterfront palace mood. Raffles is more modern, higher and more shopping-connected. It is also more practical for guests with business or social plans around Levent, Etiler and Besiktas.
The St. Regis Istanbul and Park Hyatt Istanbul Macka Palas are closer to Nisantasi's fashion and dining scene. They feel more boutique-city in scale. Raffles is broader and more self-contained. The Ritz-Carlton, Istanbul is another strong view-led option, but Raffles has the advantage of Zorlu Center directly below.