Weekly and monthly mansions
'Weekly mansion' and 'monthly mansion' are the local terms for furnished apartment rentals aimed specifically at stays from about a week up to several months — used as much by relocating workers and long-term business travellers as by tourists. They typically come furnished with basic kitchen equipment, a washing machine, and none of the daily housekeeping a hotel provides.
How they differ from a short vacation rental
Because they're aimed at extended residency rather than tourist stays under Japan's minpaku short-term rental rules, this category generally involves more straightforward contracts and is often better value per night the longer you stay, though the trade-off is usually a less central location than a hotel in Namba or Umeda.
Who this suits
This route makes the most sense for a slower trip built around actually living in one part of the city — cooking regularly, doing laundry as you go — rather than a fast-paced sightseeing itinerary better served by a central hotel base.