Sunny side of the street performed by the Bridge Band in Prague, Czech Republic

I was walking along Charles Bridge in Prague, when I saw this band playing. They go by the name 'Bridge Band'.
At my request, they happily played 'Sunny side of the street', which is one of my all time favourites, if not my favourite, jazz standards. I couldn't stop grinning the entire performance.
There is something about this tune..perhaps the chords, the laid back swing groove, or the melody..that makes it so nostalgic, happy, bitter-sweet, and bouncy all at once.