I was in Deniz Hotel, a cozy space 5 minute walk from the Blue Mosque. The space felt like it used to be a traditional home converted into a bed and breakfast. The staff are friendly and helpful, with decent English language skills. Breakfast is offered at the roof with an open to sit in the open air. Great value and location. The roof of the room is low so if you're over 5'5" you might have a hard time being comfortable. There is also no elevator and it's a hard uphill to get to sultanahmet - something to keep in mind if that's an issue for someone, even though it's a maximum of 3 flights of stairs to go up depending what floor you're on. Otherwise the space is clean, good price, good location, and safe. there is a little convenience store steps away for snacks and water, and there are travel companies also steps away to book tours and shuttle to the airport - the hotel also offers private taxis to the airport but more expensive than the shuttle