When are you going? I also just booked 2 nights Sheraton Hiroshima, 2 nights Suiran, then 2 nights Westin Miyako, all over the Thanksgiving holiday week. With the off-peak pricing, getting Surian for 70K instead of 100K seemed like a good deal, and we were able to apply SNAs to Hiroshima and Surian, with the later SNA into a room with private outdoor Onsen. As for the Westin, I e-mailed the concierge there and she said they don’t take SNAs, but pre-booked me into a junior suite and said if there was a better room available at check in, they would definitely give it to me. But I am a Titanium, so YMMV.