I used the Cefn Coed cottage as a base for a walking holiday. It is perfectly located in beautiful North Wales and a small scenic drive from Snowdon itself. The cottage was perfect for me a friends to stay in with comfy bunk beds and a large sociable kitchen/living room. The owners live on site and are friendly welcoming but also leave you to your own devices!
Only downside is one shower/toilet for the whole cottage - however a minor point.