I would rate it 5 star for the particular poojas that are done here. Roads from Mumbai need another year or more before they get a 5 star but the 6 and 10 lane highways with a divider are steadily developing.
There are some particularly auspicious days in the year when you should not venture there without a hotel booking. In Trambakeshwar the resorts vary from 2 star to dormitories. If fussy then book in Nasik. Ginger seems the best of the budget resorts there.
Drawback is it is a 1/2 hour drive form Nasik and a further delay for parking and finding the Shiv temple. As poojas start early this means waking up still earlier. The trip is scenic but dont expect more. There is one main and several smaller old Shiv Temples. Not spectacular. Again I emphasize, it is particular poojas that can be done here that make it so famous.
May Lord Shiv bless you.