We stayed at Comfort Elite for three nights mid-October...
The hotel is situated perfectly between Old Sultanahmet & new town. It is a few minutes walk from the Grand Bazaar and about a 20 minutes walk downhill to the Blue Mosque. The tram stop is close to the hotel or you can easily find a taxi (you will need to haggle on the quote given).
The hotel itself is clean and comfortable and is perfect for a short trip, the breakfast is basic, but good and enough to keep you going until lunch. I only have two gripes about the hotel, 1) the shower had no curtain or door & the bathroom would just get too wet... 2) the staff were polite, but no one smiled or went out of their way to talk to you and having been to Turkey many times I know that this is something that Turkish people, especially hotel staff are really good.