Vienna's Ringstrasse, the boulevard that replaced the old city walls, forms a clear loop around the historic centre, making orientation simple even for a first-time visitor. Inside that ring, the streets are flat and well maintained, ideal for long walking days without much physical strain.
The city rewards slow walking as much as covering distance, with quiet inner courtyards, coffeehouse interiors and small squares tucked just off the busier streets. Parks like the Stadtpark and the grounds around Schonbrunn Palace extend the walking experience well beyond the old town itself.
Distances to sights slightly outside the centre, like Belvedere Palace or Schonbrunn, are longer and better paired with a tram or metro ride, though the approach on foot through residential streets is pleasant if you have the time.