A block of flats is taller than a villa. A villa isn’t as tall as a block of flats.
The city centre is noisier than the suburbs. The suburbs aren’t as noisy as the city centre.
A cottage is smaller than a bungalow. A bungalow isn’t as small as a cottage.
Houses are more expensive than flats. Flats aren’t as expensive as houses.
Cities are more crowded than villages. Villages aren’t as crowded as cities.
The suburbs are more beautiful than the city centre. The city centre isn't as beautiful as the suburbs.