As suggested, I re-confirmed my reservation 1 week before my arrival, along with my request for the complimentary shuttle to meet me at Nyerere Airport late that night. It was confirmed on the Expedia website that the driver would be there to meet me for the ~4 minute drive to the hotel. But no driver was there. Finally, after roughly 2 hours (nearly 1:00 am) with some kind help from the airport staff, a shuttle did arrive.
Once finally there, I was greeted by a very polite and apologetic night manager, who showed me to the room. It was clean and comfortable, and that was all I needed. He had a nice breakfast fixed for me before I departed for the airport in the morning, and he and all the staff were very kind. I would stay there again, but would plan other transportation from/to the airport.