Communication with Yakup was very good and easy. He was very helpful and could answer all our questions at any time. Don't hasitate to ask for earla checkin or late checkout. Leaving the bags before or after you stage is absolutely not a problem.
We found the apartment very clean. And huge: two bedrrooms with 3 and 2 very good beds; huge living room; very good equiped kitchen and bathroom. And since we traveled in marc, and it was pretty cold in Istambull - it was always nice to get in appartement where it was nice and warm... The appartement is 2 minutes walk from Taxim main street. Just few steps to supermarkets, restaurants (don't mees the best kebab in the world in Taxim Square), shops (there is a great shop in Sıraselviler street with handmade cowboy boots - the guy is a magician).
I would really really recommend staying at Yakups place... I'll defenetelly do it again...