Ali is an excellent host, very hospitable and responsive.
He gave us some useful suggestions on transport and things to do.
The apartment is large, very clean and comfortable, with a lot of useful things.
It is near (few minutes walk) to main monuments in the old city area, like Blue
Mosque, Ayasofya, Topkapi, Basilica Cistern. It is also near to Gran Bazar, Spice Market, Suleymaniye Mosque and many other wonderful place to visit.
Istanbul is an amazing city, safe to visit, with plenty of things to see.
Thank you Ali, hope to come back soon!