If in the past you've been a great fan of Sawadee (that little restaurant just off Kloof Nek Road) then perhaps you'll be pleased to know that their sushi chef has move and opened a restaurant lower down on Long Street, where it intersects with the brick-paved Waterkant Street (map).
We met up with a friend at Phad Thai on Saturday evening. The sushi was as great as it had been at Sawadee, and the restaurant wasn't as noisy or crowded as I believe it can be during lunch hours.
It's not a pretentious restaurant by any means - the décor is modest, and there's no need to haul out your best Levis, or most plush dress. If you've never been, you'd probably do yourself a favour to visit pay Phad Thai a visit for a late lunch or early dinner.