We had a fantastic experience at Lyudmyla's apartment. She was wonderful and walked us through her wonderful apartment when we first arrived. The space was perfect for two to four people - it was very comfortable and up-to-date. The location of this apartment is pretty perfect. A few blocks down the hill puts you at the tram to take you to all the tourist locations. A few blocks up the hill puts you at Taksim Square and Istikal. It had a great local, neighborhood feel with small stores nearby for groceries and a few small cafes nearby -- although there are tons of restaurants around Taksim Square.
Would highly recommend :)