The Domus Sanctae Marthae is a building adjacent to St. Peter's Basilica in Vatican City. Completed in 1996, during the reign of Pope John Paul II, it is named after Saint Martha the hospitable, who was a sibling to Saints Mary and Lazarus of Bethany. The building functions as a guest house for clergy having business with the Holy See, and as the hotel residence of the members of the College of Cardinals when they are participating in a Papal Conclave to elect a new Pope.
Pope Francis has made it his home since his election in March 2013, declining to use the Papal apartments in the Apostolic Palace.
Wikipedia https://en.wikipedia.org/wiki/Domus_Sanctae_Marthae
Coordinates 41°54'2.409" N 12°27'12.045" E