Şeyda's place is very centrally located if you're looking to be on the Anatolian side of Istanbul (which we were), and close to Bağdat Av.
It's walking distance from the seashore, which is a treat if you like views as far as the eye can see.
Both her and her brother were very responsive, helpful, and made themselves available for any potential requests I may have had.
The place itself was clean, with all the amenities you can imagine, with lots of thoughtful details. For example, if you have kids, they have a little baby bath tub, and a crib, which we really appreciated as parents.
One thing of note is that the apartment is 4 floors up, which isn't a problem for most people but can be a bit challenging if you have mobility issues.
Overall a great experience, and I would (and will) rent this place again.