The Bella Donna (formerly called the Summer Night City Taverna) is the hotel formerly run by Donna Sheridan-Carmichael now run by Sophie Sheridan and called the Bella Donna in memory.
Mamma Mia! (2008)[]
The Bella Donna is first seen when Sophie sings "Honey, Honey" to Ali and Lisa. Then when they see Donna and when Sam, Harry, and Bill arrive on the island. Then it's seen during the songs (Mamma Mia! and Dancing Queen). Then the hotel is seen during the Bachelorette party and during the wedding.
Mamma Mia! Here We Go Again! (2018)[]
It is the hotel Sophie runs after her mother, Donna Sheridan dies. Not much is known about the hotel, only that a woman named Sofia owned it until 1979, when Donna took it and turned it into a hotel.