The most popular regions for treks in Nepal are Annapurna, Everest Langtnag and Upper Mustang. All these places have good quality lodges, well managed, variety of food to choose from the menus available and boast of Wi-Fi, bakeries etc.
Around the areas that have lesser trekkers like, Makalu Barun, Manaslu, Kanchenjunga etc. the tea house/ lodge are very basic in comparison.
Basically good lodges have developed where foot traffic is the most and Annapurna, Everest and Langtang receive the most trekkers in Nepal.