It was great, the doorman was also quite helpful in arranging a taxi for us back to sabiha gocken Airport. We had easy access to the local T1 metro line which takes you directly to sultanahmet Station.
It takes about 10 minutes to go from Tophane metro station to Sultanahmet, from there you can walk to the either of the major mosques.
The accommodation was well kept and clean, we also opted to use the sauna during our stay. There is also a mosque just 2 minutes away from the apartment.
Just be aware that the Galata area contains many steep hills, so if you struggle with walking due to age etc... then this can be an issue.
All things considered, I would recommend this to others, but no more than a group of 3 adults, assuming you all sleep separately (2 beds, 1 sofa). There are no shortage of shops nearby, cafes, restaurants, groceries and other amenities can be found locally.