Duygu, our host, she was great. The apartment was clean. Our apartment had a dishwasher, laundry, vacuum cleaner, fridge, dinnerware for 4 people and 3 cups for Turkish Coffee. We had access to the Pool, gym and Sauna.
The nearest metro is Taksim which is about 1 km away. You can take Uber :-). Walking to Taksim Square and lstikal Street is about 1 – 1.2 km climbing uphill, but downhill going back and uphill when leaving the property (pretty much all Istanbul is the same anyway).
Also keep in mind that pedestrian crossings without traffic lights are treated as street ornaments. Unlike what you may be used to at home, in Istanbul cars will not stop to let you cross the street. Wait for traffic to pass or cars to stop before you try to cross the street. Be patient, you can wait 5 min., you are on holiday.