We (4 young women in their mid-twenties) just had the most amazing long weekend in Istanbul, staying in Alexis' flat, which is exactly as shown in the pictures, super clean and comes with everything you need plus a super nice welcome committee (i.e. his mom- Sofi, thanks for showing us the flat!).
Alexis and his parents are very considerate (as evidenced by bottled water, toilet paper, public transport card and other "basics" already provided). Also, Alexis is very responsive and can always be counted on to answer any questions in record time. Biggest plus for us was the fort-know state-of-the-art security door, which helped even the most concerned members of our group sleep easy at night.

What else? Location is quite good, really close to Taksim, where you can take all kinds of public transport to every part of town.

All in all, I can recommend staying at Alexis's when in Istanbul. I would do so again.