What are the best features to look for in a multi-functional home appliance that combines a water filter, vacuum cleaner, and air purifier?

When looking for a multi-functional home appliance that combines a water filter, vacuum cleaner, and air purifier, the best features to consider are efficiency in filtering contaminants, strong suction power for cleaning, and effective air purification capabilities. Additionally, look for user-friendly controls, easy maintenance, and a compact design for convenience.