I would say this HPTDC property as one of the worst manages (being stayed in other HPTDC properties), maybe due to the fact that parwanoo is not a much visited tourist destination.
I stayed there once with my family as night halt while driving down from Shimla to Noida. But the experience was not so great. It was more or less like a govt run property and the rooms were also not well maintained. The restaurant service was also very slow and sometimes we need to wait for quite some time aftre placing order.
I would suggest to plan for stay only as last resort (or when you have budget contraints) since quite cheaper then other hotels nearby.