There are short staircases starting from the reception to go to the rooms. Although not very long. I would recommend requesting for a room on the lower floor. The kitchen and eating area is accessible by a short staircase. If you are planning to go to Uttarakhand with your knee problem then I am sure you are braced for short climbs up and down stair cases. I hope this reply is useful.
Thanx. Have a lovely stay.