Sometime between Metastasio's death in 1782 and 1786 (most likely in 1785), the Martines family moved to the first floor of building No. 25 in the Herrengasse. This building, which no longer exists, stood at the eastern end of the street, on the corner opposite the old Burgtheater and the palace: that is, diametrically across the Michaelerplatz from the house they had lived in for over half a century. With both parents dead, Dionysius in Bohemia managing the imperial gold and silver mines of Joachimsthal (Jáchymov), and Johann Baptist in the army, the Viennese family was much reduced. Metastasio's death relieved them of the need to maintain the establishment on an upper floor of the Altes Michaelerhaus and left them with plenty of money to move to a residence on a lower, more fashionable, and more convenient floor. Marianna's youngest brother Carl Boromeus rented the apartment as tenant of record, for 1,000 Gulden per annum. As Hof-Concipist in the Austro-Bohemian Chancellery, and with his brother Joseph as Hofrath (court councilor), there could be no doubt of their eligibility to occupy such an apartment.

The Martines family in Vienna now consisted of Joseph, Carl, and their two sisters. Their new first-floor address provided them with ten rooms, a kitchen, access to a stable, a cellar with firewood bins, and, on the ground floor, a small room for a servant and another kitchen. These spacious accommodations for just four people on a lower floor must have made life considerably easier than it had been in the Michaelerplatz: apart from the toil of climbing to a third story, one has only to imagine the difficulty for a fashionable lady in a heavy hooped or bustled gown as she negotiated the steep, narrow, often spiral, stairs that one must still climb to the upper floors in many old Viennese buildings. The new apartment not only spared Marianna and her siblings the exertion of climbing to the third floor but brought the family closer to the rest of the society to which it now belonged. In a letter to Bertola, undated but probably written in November 1786 or shortly thereafter, she reported proudly and happily: “You do not yet know that we have moved, exchanging our residence for one that is much more beautiful and convenient, on a first floor, in the Herrengasse, No. 25.