What Is This Place?

The dust-filled apartment had come alive in the mind of the experts. The apartment was luxurious and beautiful. They imagined elite people mingling in parties thrown in the apartment. Every part of the building represented the elite lifestyle of those time. It had expensive perfumes decorated on the dressing table. The place was furnished with luxuriant furniture and had many fancy dresses in its closet that gave a rich look to it. Surprisingly, most of the item concerning Mrs.De Florian was not touched at all. The woman died in a countryside many miles away from this apartment that had been holding her most valuable items. Why did she do that? Why did she leave her apartment in the first place?