1) Small size means it's easier to park, navigate in tight areas
2) Very good visibility, the only car I have driven that I felt had better visibility was the 2006 Toyota Yaris
3) Cheap to run and cheap to maintain
4) Typical of VW, the interior is very well put together in terms of aesthetics. Very simple and easy to use IMO
5) Handling and biting point is very straight forward and easy.
You can get one via eBay or Autotrader. I use those myself.