We always stay in Capel Curig. 3x good food pubs and a good cafe/restaurant and another good shop/cafe.
Central location for Snowdonia. Easy off-road cycle/walk to Plas Y Benin where you can use the skills area for free (if available, do need to sign a disclaimer and get a member card). PYB has a great sunset view of Snowden from the bar.
There are forest paths almost from the door and you can ride to the Marin and Penmachno (don’t go to the start. Look at a map and it’s not far to do get to either half way round). CYB and Antur are less than a 45 min drive. Llandegla is also about 45min. Snowdon is about 10 mins to the Pen Y Pass car park. You can also pick up the Sarn Helen trail which I really liked.
There are a few cottages. We have stayed at most of them. We would recommend
https://www.wales-cottages.info/north-wales/snowdonia-mountains-and-coast/tan-rallt-cc612004
As our favourite however we have tried to stay at
http://www.northwalesholidaycottages.co.uk/cottages/tanral-nw/
But it’s always booked by the time we get our act together.