Didn't get to meet Mustafa but he promptly gave me Bahar's contact the night before our arrival - she was prompt in responding to my texts and stayed up to meet us since we checked in near midnight! Ada Home is a lovely service apartment near Taksim but not in the noisy bar-filled alleys. Less than 5 min walk from Istiklal which was very convenient and about 10 min walk to Point Hotel if you're taking the airport shuttle.
The one room apartment had a full kitchenette with basic utensils and crockery so you can do some light cooking. Room was very modern, clean and sufficient for 2 persons. Good wifi. Very secure too with 24/7 reception and a security code to let you in. The room advertised said ground floor but we had ours on the 3rd I think - like I said, just take note it's somewhat like a service apartment which is very common in Istanbul. No breakfast included but Bahar recommended a great local Turkish brekkie place parallel to Istiklal which was 5 stars, thanks Bahar! There's a local restaurant downstairs too which serves a brekkie buffet for 15tl so make it worth your liras. Great place to enjoy a game of checkers with some çay and hookah too.
Only stayed at Ada Home for 2 nights and we were out most of the days exploring, but I'd love to come back and stay again. Thank you for all the help Bahar and Adam - and thanks for the turkish delights treat! :)