Your typical rental will look something like the above picture. There are 2 reservoirs. One for water + cleaning solution. One for waste. The wand is dual purpose. It has a nozzle to spray cleaner & the head that sucks. You just trigger the fluid & pull the head toward you, overlapping each pass slightly. It is not difficult. I don't know, 10 minutes for a bedroom size room? But you have to keep emptying & refilling & lugging the beast up & down stairs.
I don't remember the cost but under $50 for a day iirc.
Ian