Funda was an excellent and helpful host.
She lent us two Istanbulkarts for the metro system (we just topped them up before returning them to her)--this made initial navigation of the city and metro system cheaper and easier (better rates with the card than without!).
She also lent my wife a jacket for a couple of unexpectedly cool days. This was indescribably wonderful and saved our trip!
The apartment is in a very good location in the Beyoglu area--close to Taksim (easy airport access), Galata Tower and Bridge, Blue Mosque etc. By close I mean walking distance (you'll enjoy more of the city and people this way unless you need to take the metro which is also close by). Great places to shop and eat here, too. Look for Khave 6 for breakfast...
As for the apartment it is very clean, comfortable, and has all the amenities you might need (living room, big queen bed, private bedroom, bath and shower big enough for two with lots of hot water, WiFi, full kitchen, etc.). It was a perfect HQ from which to explore lovely Istanbul.
We would stay again and again!