I stayed with my wife and son in Kubilay Suite #8 for three nights and it was great.
The place is close to infinite number of historical places; a tram stop is close; Marmaray station is within 20 minutes by foot; the area is packed with restaurants, shops etc.
The room was super clean. We got a terrace with sea view.
One has to be physically fit to climb the stairs to the room; which is OK for us.
Generally, the place exceeded my expectations.