Eric, this is what I have:
Marie Redwitz, Duchess Marie José's lady-in-waiting, wrote in her book "Hofchronik":
1919. The Queen of Naples has also returned to her parents' house and lived, just like the Duchess (= Marie José) herself, on the second floor.
Arrigo Petacco ("Die Helden von Gaeta") quotes an interview Marie gave an Italian journalist called Ansaldo in November 1924. By then, Marie was still living in the Maxpalais. Petacco knows that she was her nephew Ludwig Wilhelm's guest. It's quite strange to imagine that the former Queen and the Reichsbank (today Deutsche Bank) had to live under one roof.
One of Marie's servants, Mr. Barcellona, said in 1923: Every evening at 5 o'clock the Queen's sister, the Duchess of Trani, comes here (= Maxpalais) to have tea with the Queen. The Duchess lives in the hotel "Vier Jahreszeiten" in the Maximilianstraße. Then I usually read aloud from the newspapers, because the Duchess of Trani, although she is younger than the Queen, isn't able to read without her glasses. The Duchess of Trani is 80 years old. The Queen says that their conversations are gloomy. Then the Queen always accompanies her sister to the hotel, which is quite far away, because it's dark when she leaves and something could happen to her.