Tatopani is the perfect place to take a break from a journey when traveling Mustang. The best thing for me is the view of Mt. Dhaulagiri, hot spring water, and food. The view is special because you hardly see this combination of snow capped mountain, hills at the background of a village.
After the tiring journey you definitely will love the hot spring water which is right beside the road.
Last but not least, the hotels offer varieties of food - Nepali, Italian, Continentals etc including bakery item. Coffee is obvious.
Make sure to visit Mustang if you are traveling Nepal.