We were fortunate enough to book a couple of days in Mehmet's place between periods of its full occupancy, during a still-hot touristic season of late September. Unfortunately we had to move to another hotel after that, but would have stayed there if possible, as the place does not dissapoint. Located in the beautiful (should I mention historical) center, neat, affordable, and sporting a refrigerator -- looking at you, other two hotels we stayed after :) -- this is an all-round good choise for anyone who travels on budget or wants to forgo overpriced hotels and spend his time and money on what is more becoming in Istanbul, that is, exploring every bit of the city.
Mehmet was very polite and helped us to organize mobile internet connection, which was very helpful for us the first-time Istanbul visitors.