Personally I'd look to get a B&B since you'd want to take in Maen-y-Bardd, the Rhiw chamber, Cerrig Pryfiad as well.... numerous other stones around including the Hafodty circle. The Drum ridge would also suite someone like you.

But if you want a quick introduction to The Carneddau, reckon you could make Tal-y-Fan OK and start planning for the next trip. Have a go, but be prepared to want to come back as soon as you get home.