I wouldn't hesitate to reccomend Snowdon House. My family and I had a lovely few days there. 8 of us filled the house with room to spare. One room is quite snug, so ideal for one person or a small couple! Be prepared for steep staircases though; hard to navigate after going up and down Mount Snowdon! The hot tub is lovely and you can see the house whilst walking to the summit of Snowdon.
A couple of things were broken or missing and it was a bit tricky to work out how to use the oven and the heater. This was very probably oversight as the owners have been nothing but helpful. We were slightly stuck during our stay however as there is no real mobile reception in the house so we couldn't contact the owners to let them know what was broken or missing. A landline telephone would be quite handy. Wifi is available but you have to pay to use it.
All in all, the place is lovely and makes a fantastic base for exploring Snowdonia.More