No one ever described the papal apartments as "sumptuous." The papal bedroom is actually spartan.  Castel Gondolfo was used by prior popes to escape Rome's summer heat and humidity.  No need for Bergoglio because Martha's House, built in 1996, has modern HVAC.  "Sandro Mariotti [is] alternately called the pope’s valet, butler or assistant." 
"Castel Gandolfo Group Tour before these rooms are opened 31.00 € per person The price of the tour includes: guided tour of Barberini Gardens and Pontifical Villas booking fees (5.00 € per person)." 
Like leasing part of Vatican-owned buildings to Hard Rock Cafe and McDonalds', nothing wrong with making an honest profit. Nothing wrong with the pope having a valet. Just goes unreported because it doesn't fit the PR pope's image.