Although Stuttgart is a massive city with over 600,000 inhabitants, the city centre is easy to explore. You can take the tram or metro from Vaihingen and be in the centre in 15 minutes. The major attractions are more or less on a one kilometre line with the lively Schloßplatz on one side and the no less lively "Biergarten" in the city park on the other. In between are shopping streets, a market hall full of colourful shops and a centuries-old castle, and the lively Karlsplatz with resaturants, bars and flea market.