We stayed two weeks in Alex's flat. It is a comfortable apartment with all the necessities you need, though it should be noted that the balcony is not really big enough for two people to sit on. It is very well located. It is a short walk from Taxim square (with its excellent transport links - metro bus and dolmus and airport shuttle) and iconic Istiklal street. The flat is very quiet despite being in the heart of Beyoglu district. The area also has many local shops, restaurants and banks. I definitely recommend it.