The location of Parvin's hotel is very central, thus close to many of the major historical landmarks a tourist would like to visit. That being said, it's still a very quiet area, a few blocks away from the hustle and bustle of Sultanahmet.
The room was very clean and cozy with furniture of pleasant colors.
The service was top-notch. The people there are super nice.
The only thing to keep in mind is that you'll have to walk up and down the hill from the tram station/Sultanahmet but to me that's only the charm of Istanbul!
I would definitely come back!