The difference between the Rocket Appartamento and the Rocket Appartamento Compact does not appear to be directly in the information provided. However, there is no specific "Appartamento Compact" on sale in the official Rocket Espresso range. The Appartamento is already designed as a compact machine suitable for small spaces. If you are looking for specific differences, it could be a mix-up or a special edition. For more detailed information, I recommend consulting the official Rocket Espresso website or asking a dealer directly.