I stayed at Silintong Hotel for 4 days on a company event. The rooms were reasonably clean, the staff quick and friendly, and the view was nice. There was another hotel in the Lake Toba vicinity (*cough* Hotel Carolina *cough*) that I had stayed in, and was determined never to come there again. I am glad this time, we didn't have to stay at that other horrible hotel.
The Silintong Hotel was definitely an upgrade. The response of the staff was very reliable, and the food was very tasty although the breakfast could be better. What I like most was the flowers, mostly orchids, all around the hotel complex which was really a beautiful sight that greets you as you are pulling in from the dock (we took a boat there).