We have just returned from Isallt today. The property was fabulous. It is more spacious than the photos convey with everything you could need to make you feel that you are at home. It was furnished and decorated very tastefully. The beds were very comfortable. The kitchen is fully equipped for self catering, ie. pans, knifes, baking trays, crockery etc so there is no need for eating out if you do not want to. It is ideal for children as there are 2 stairgates, a highchair and a travel cot. (We actually brought our own Hauck travel cot which was the same as the one provided. We find it necessary to use our regular cot mattress with it as the travel cot mattress provided is quite thin and hard.) There is an enclosed garden so it is safe for the children to play, with the added bonus of a calf and lamb who live in a shed next to the garden. My son was able to feed the calf one day which he loved.
My biggest recommendation for this region is the ice cream shop in Harlech - it is just up the hill from the castle. It is truly amazing ice cream, better than any I've ever had anywhere in the world. We went 3 days in a row, was too embarrassed to go for a 4th time!!