There are several hotels in Sinop, offering decent accommodation at reasonable prices. The one I stayed at uring my visit in October 2009 was Bossinop Hotel. It is located right at the roundabout in the centre of the town; all rooms have partial views of the sea and the garden opposite the harbour.
Hotel Bossinop is the tall silver-grey building second from the left in the photo above, the whole building is newly furnished with a nice coffee bar-restaurant on the second floor. Room are spacious and comfortable, all equipped with modern shower and toilet facilities, high speed wireless internet, fridge and plasma TV.