Here are some links we used to do our advance hotel/air/train/visa reservations that might be helpful to others:

https://evisa.gov.az/en   = Azerbaijan online E-visa - cost $24 each

https://www.evisa.gov.tr/en/  = Turkey online E-visa  - cost $20.70 each

https://ebilet.tcddtasimacilik.gov.tr/view/eybis/tnmGenel/tcddWebContent.jsf  = Turkish Trains - very cheap!

Since our train was departing Kayseri at 00:53, each couple booked a 2-bunk private cabin using our age 65+ (50% off discount). Cost was a total of  TRY129 ($38) per cabin. Nice sink & refrigerator in each cabin.

Then we  decided to book all 4-bunks in a 4-bunk Business Class cabin so we'd have a place to talk, early riser sit, etc. Again, booked all 4 bunks using Senior Citizen price of TRY29.50 each so 4-bunk cabin cost us a total of ($35).



https://p.turkishairlines.com/ = Turkish Airlines for flight IST-Kayseri. Total cost for both of us was TRY189.98 ($55)

http://hamptoninn3.hilton.com/en/hotels/turkey/hampton-by-hilton-istanbul-zeytinburnu-ISTZEHX/index.html?WT.mc_id=zLMWA0TR1HP2NaturalSearch3Google_LGHotelListing4DGGeneric_Jul5LocalSearch6ISTZEHX7EN8i1   = Hampton Inn near IST airport. I liked this hotel as it $10 taxi to hotel, includes breakfast, close to various modes of transportation, location is great, luggage hold if we need it. Booked in advance, total cost for 1-night was TRY230.47 ($65).

We booked our Cappadocia hotel via Booking.com to stay 4 nights at the Goreme Anatolian Houses. Total cost with breakfast in a Cave Suite for the two of us, with breakfast, overlooking the Fairy Chimneys was $325. It was a non-refundable fee, however, on Sept. 10th I saw a price of $234 for an Arch Cave Suite. It's guide showed 2-single beds, but photos were of bigger beds? It was the cave concept & amenities that attracted us! No pre-payment so will pay when we stay there.

https://www.booking.com/hotel/tr/hekimoalu-otel.html  - Again used Booking.com to book rooms in Erzurum for us, and including breakfast cost $34 per room.