Just had a really good experience reserving an extra night at the Athens hotel Hera for the March 26 tour. Contacted them late yesterday and received an answer this morning. They made it very easy, and included a secure link to reserve, a first for me.
After 13 tours, I've had some experience with this, and while this one was particularly easy/fast, I've mostly had positive interactions with tour hotels.
My most annoying experience was last year's Hotel Dikker & Thijs in Amsterdam. Repeatedly told to check back later, first months, then weeks. In the end (after many months) they said to use the regular online method. I could have done that at the beginning. By then I had decided I didn't need to stay in the city that last night and reserved at the airport.