My friends and I stayed for 3 nights in Emin's apartment. It was a wonderful rest from the first to the last second.
Emin and his brother were hospitable, responsive, quickly helped when we needed help.
The apartment is very cozy and interestingly furnished. Despite the small size, it has everything for a comfortable stay of 3 people. The location of the apartment allows you quickly get to Istiklal Street and Taksim Square, near there are grocery stores. Nearby is the mosque, so a muezzin singing at 7:20 will not let you oversleep the valuable minutes in Istanbul :)
Definitely advise to stay here!