The host is always so generous.
'Generoso' = ge-ne-RO-so, stress on third syllable. 'Sempre' = SEM-pre.
Use this to open conversation by complimenting the host with someone who knows them well. It shows social grace and positions you as appreciative and warm. It will usually lead to stories about the host that help you understand the social group.
'Padrone di casa' (literally 'master of the house') means host. 'Padrona di casa' for a female host. The expression is used for the person hosting an event in their home. 'Sempre così' (always so) implies a regular pattern of behaviour.
Come sempre, ha preparato tutto alla perfezione.
As always, she has prepared everything perfectly.
Complimenting the organisation quality
Si sente che ha messo tanto impegno.
You can tell she put in a lot of effort.
Acknowledging the work behind the party
La sua ospitalità è leggendaria.
Her hospitality is legendary.
Hyperbolic compliment — very Italian in style
Italian hospitality ('ospitalità') is a deep cultural value — hosts are expected to provide abundant food and drink, making guests feel welcome and pampered. The concept of 'non fare la figura dello spilorcio' (not appearing stingy) drives Italian party hosting to impressive levels of generosity.