Haven't been Penny but it is very newly refurbished and is a cross between a heritage centre and luxury small hotel. Castlecoote itself is a really nice unspoilt/un-prettified pastoral area. If you're into fishing, walking (proper walking through fields that is), escaping to the country, built and natural heritage, you will probably really like it. If you like to be entertained, you won't not find very much to do; one pub in Castlecoote, no restaurant. Nearest town is Roscommon and there no cinema and few restaurants there but it's great heritage spot, if you're into it and know what you are looking for.
Would love to know how you get on!
Rebecca