A good budget option, we have enjoyed the stay and would recommend it.

Positives:
a) Location: close to Bazaar (4 minute walk) and the heart of Sultanahmed (max 10 minute walk). Also, you evade the touristy "Disneyland" area (streets full of accommodation and eating facilities that all look the same and cater only for tourists) which lies east from Blue Mosque. Still, there is plenty of "tourist infrastructure" (caffes, places to have breakfast or meal, shops) in the neighbouring streets.
b) Price/Value: the room corresponds to the description (clean etc.).
c) Responsiveness: Kamil responds immediately, offers airport shuttle etc.

Negatives:
Only one and probably quite subjective. Having been to Istanbul on business trip the day before, and having stayed at Intercontinental (IC) at Taksim, the move to here has made me very aware how different the two are (Kamil's is a small room - facing small street - where one tends to spend the night only). That said, if you are considering this accommodation, it is probably because you are price sensitive (as I am) and as such the room (we had one double on the 2nd floor) was worth the money and I would recommend it.