After a satisfactory flight from Belgrade to Istanbul on a plane that was less than 20% full (I didn't know that such flights still took place!), some air traffic delays getting into Istanbul and a much higher-than-expected visa-on-arrival fee, we're now established in a modern and comfortable, if slightly squishy, room in Istanbul.
No photos yet, but my initial impression is that the Sultanahmet district depends greatly on tourists, literally from all over the place. We went for a fascinating walk last night and had a pleasant dinner. No problems at all about getting a beer to drink, but definitely no bacon on the breakfast buffet.