I've been to Izakaya a couple of times and really enjoyed it. It serves pretty authentic Japanese pub-style food, and it's on Mermaid Quay (tel 029 2045 2977) - i.e. close to where St David's Hotel is. It's the sort of place that's possibly better with a big group of people, when you can kick off your shoes and occupy one of the tatami-mat rooms, but even if there are just two of you, I reckon it's still worth a go. Having said that, it is a while since I was there... I hope it's still going strong.
