Erzurum is a very safe city...or at least it felt safe to me. There is a huge army presence, but this doesn't seem to cause any problems...might be wise to stay away from military areas, and be careful where you point your camera, just to be on the safe side though. Other than that, the main worry will be the heat and the thin air. Coming from humid Trabzon in August, I found the climate to be challenging...the sun is strong, the air very thin, and it is a surprisingly windy city, so there is always dust blowing around. It is easy to exhaust yourself walking short distances, and I developed a nasty cough from the dust. Don't overdo it on the first day, and have plenty cay breaks! The photo shows the Cifte Minareli Medrese and the surrounding city as seen from the kale's clocktower.
erzurum,is more than 1900 m high,it is extremely cold in winter,I had -4°C at noon and -15°C at night,it is the biggest city in north-east turkey