No worries, Garnffrwd is an excellent smallwater of about 5 acres. Jamie the owner is a friendly and helpful guy who has a gem there.
Heres the link to the website
http://www.garnffrwdflyfishing.co.uk/
Regarding Penderyn, when it's on song it's a good fishery but looking at the catch book theres only one or two, if any coming out each day at the moment despite up to 20 anglers visiting there regularly. Just a little further away you have Beacons Reservoir and Cantref Reservoir or if you fancy saltwater fly fishing you have the Gower with some good places for bass.