Yes, Donan House is very, very close to the Eilean Donan Castle - I could see it sitting on our bed, or while brushing my teeth at the bathroom sink (for much longer than usual - if I had this view at home, I think my teeth would be much whiter ...).
And I'm telling you we loved the place! The room is nice, and it's very spacious, and spotlessly clean.
The cooked breakfast was fresh and tasty, and the hosts are nice and friendly - not as the person who complained about being asked by the host to take their shoes off warned us they would be!!
I warmly recommend Donan House - you'll love it too!
