Don Tommasino's Villa
You are right!
Don Tommasino's Villa is featured in several scenes throughout all three parts of the Godfather trilogy
It is the villa where Apollonia died in a car bomb hit and the villa where Michael dies at the end of part 3

I don't know this doctor -- but seems strange that the said Villa which one would think have 'impenetrable' security like Tahoe! has become too dangerous for Michael
Quote
Don Tommasino: [In Italian] -- Eh -- This place has become too dangerous for you -- I don't think you're safe here
I want you to move to a villa near Siracusa, right now -- Subita, eh?

With folks like Don Tommasino! on the job from 9 to 5!! [Ref: Dolly Parton]
Originally Posted by mustachepete
Extract: he leaves from there in the morning, he returns there at night