Featuring a heated indoor pool, Ener Old Castle Hotel is situated less than a 10-minute walk from the Sea of Marmara. It offers air-conditioned guestrooms with free Wi-Fi. Spacious Old Castle rooms have modern furnishings and are decorated in neutral colours. They include LCD TV with satellite channels and have private bathrooms with luxury amenities. The hotel has a restaurant with an à la carte menu that serves Turkish cuisine and a lobby bar that offers cocktails. Each morning a buffet breakfast with fresh fruit is served. Ener guests can relax in the Turkish bath or sunbathe on a lounger near the outdoor plunge pool. The Castle Hotel also has a fitness centre with free weights and cardiovascular equipment. Ener Old Castle Hotel is located 1.2 km from the Eskihisar Ferry Station which offers transportation across Izmit Bay. The hotel has a 24-hour front desk and provides free on-site private parking.