We stayed in Leda's apartments end of March tis year and I should admit that even being in Istanbul for many times it was first time when I enjoyed the city from local perspective.
The flat itself is very fresh and nice, with a lot of light. And was big enough for 3 couples. It was a pleasure to come back after long walking day to the apartment.
But the main highlight is the district where the flat is situated. It is full of life: lot of grocery shops with all the Turkish traditional delights and food. And it is so authentic, not like nosy streets of Sultanahmet full of tourists and merchants. It is very close to Sisli and Nishantashi districts and also walking distance from Taxim square. Would recommend the apartment without any hesitation!