Celal was a wonderful host. We arrived at his apartment on a sweltering hot evening and he arranged two bowls of ice cream for us. He was always willing to help us with recommendations of places to go and guidelines on how to get there. The apartment itself was great. There was however only one 3/4 used roll of toilet paper. We hadn't been alerted to bring/buy our own toilet paper so we had to pop out to go buy more loo roll. The bathroom also seemed to have a leak somewhere so we ended up leaving one of the provided towels on the floor to mop up the water.
Celal's apartment is in close proximity to great restaurants, the Grand Bazaar and loads of alleyways for shopping. It was also very easy to get to the Metro station and then take a tram from Beyazit station.
Overall, we enjoyed our stay here. If ever we're in Istanbul again, we wouldn't hesitate to stay at Celal's apartment.