Larger chain hotels generally have larger rooms –  similar to what we experience in North America. They may have elevators, night staff, perhaps room service as well.

Standard European hotel rooms are generally much smaller. The floor space around the bed may be large enough to walk around but space for luggage may limited. 

The bathrooms are generally small and the bed sizes are narrower.  Standard twin beds in Europe are 35” x 79” whereas in the US they are 38” x 75”. A double room may be two twins pushed together.