Sümeyye's flat is very clean, has all the amenities you would need and it's in a great location. Very easy to get to historic peninsula and city centre via public transport (I picked it as it's close to the hospital though). We didn't have a chance to chat but Sümeyye is very responsive to the messages and helpful to make you feel comfortable at home. I highly recommend her as a host and her flat as a great place to stay in Istanbul.