I have plucked up the courage to try this cautiously a couple of times at home (with prop guards and other precautions). I found mine remarkably stable.
Slightly unexpected for me was the amount of down draft.
I also decided to test the automated take-off (to 4ft) which also worked. I could take my time to test the front and rear sensor reliability, to warn about the proximity to objects, as well as the craft's limits of actively blocking flight in those directions.
I also checked on an idea I came across on the internet of disabling the down sensors to allow landing on my outstretched hand. I won't do this in practice but it is nice to know I could if I absolutely had to.
I am a newbie, and cautious rule-abider by nature, so would appreciate any advice from those with more experience about testing in the indoor environment.
I decided to prepare for this by practising for a few hours on the DJI flight simulator which offers an option of flying around objects in something that looks like a hanger.
As a general comment about the flight simulator, for me I found it helpful in fitting in some air time to a busy life. The outdoor scenarios include gusty wind conditions and allowed me to improve my reaction times and practice different ways of handling the controller; including the change to a pincer grip on the controls instead of just thumb only.