Istanbul is a huge city and as you understand it's impossible to be close to all atractions, considering this fact I think that apartment has best location from any possible. If you love walking you will have in walking distance to all major attractions. Galata tower 10-15 minute, Taksim 25 minutes, major shopping street Istiklal 7-8 minutes. For us 35-40 minutes walking is totally fine so we even walked to Hagia Sophia and a Blue Mosque.
The apartment itself looks just as lovely as it is on photos. We had there everything that you may expect in 5 star hotel, plus kitchen with all necessary accessories and tea/coffee.
Irem is very helpful and will provide you with all needed information.
So I am more than happy that I have choosen Irems's apartment for our vaccation, and I am sure that for the price you won't be albe to find anything better then this.