Galateia is a somewhat expensive but top class accommodation in Istanbul. The view and location were excellent (we stayed in third floor facing west and had a great view of the golden horn, your view may be different depending on the direction and floor). The hopping Istiklal street and the Sishane metro are a few minutes walk (on a steep uphill) and the Galata Tower is a few minutes downhill. Walk about 6-8 minutes downhill to the T1 tram stop Tophane which is the best way to get to major sites such as Topkapi Palace, Hagia Sophia, Blue Mosque etc. Plenty of restaurants all around.
I am generally turned off by Airbnb places with a long list of "rules", but Galateia stay was pleasant. The staff is easily accessible and friendly. The wifi was good. This property is expensive by local standards, but you get what you pay for: location, easy checkin/checkout, view, a good kitchen (though they don't provide kitchen basics like salt, dish soap, coffee maker), excellent a/c etc.