LOCATION
This is an excellent choice for someone who wants to be close to the action and liveliness of Istiklal and Taksim but without being in an over touristy place or noisy neighbourhood. The street is exceptionally charming and has great boutique cafes and stores. It's a small (but steep) hop from the Sishane metro and small walk from Galata Tower. Also, my partner and I walked in the neighbourhood at late hours and it was extremely safe.
PLACE
It seems like a renovated building from a line of 19th century buildings. Really beautiful wooden stairs and detailing and attention to subtle design elements. Super tasteful and quiet, hot water, clean room. Place is a bit tight, but we didn't mind at all. Window doesn't look out to much but does look over a lovely tree, which is always good.
I would 100% recommend this place.