We stayed here for six days as a group of four people and can only recommend it!
The description is to the point. The apartment is located very central and near to the station "Tophane", from where you can reach the places of interest easily.
Please note: The station isn't accessible afoot due to many stairs on the way there.
This place is great for a week of sightseeing in Istanbul!
Just know that you shouldn't expect too much of the bathroom due to the building's age.
Our host Naci was amazing!
He kept in touch during the whole stay and helped us whenever needed.
We're looking forward to next time ;)