We spent a night here in December 2012 during a Kumaon trip. The locations is excellent (we could view several peaks such as Trishul and Panchachuli from our rooms). The meals were excellent. The staff was very helpful. Some members of our family had incurred some injuries a couple of days earlier, and they were very accommodating in terms of providing rooms that were more easily accessible, and sending meals to the rooms.
One aspect that could do with improvement is room heating. Mukteshwar can be quite chilly in December. We were provided reflection heaters which are quite ineffective in heating larger spaces. I would suggest providing convection heaters.
Other than that, I only have good words. Mukteshwar is a very beautiful place, and this resort is an excellent place to spend a few days in, while checking out the area.