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I had a Roomba when we lived in a flat. It's not used much now due to the stairs (and child leaving stuff everywhere).
It was really good! It doesn't hoover as well as you would - probably about 60% as good a job, but it does it every day which makes a difference quite quickly. It also encourages you to tidy up a bit, as stuff on the floor obstructs it. It used to really destroy any charging cables it found.
As @nankatsu says, I'd get one of the ones that you can program a schedule into.
Does anyone have a robot hoover?
Me and my wife just cannot he bothered to hoover all the time. So I’m considering a robot hoover for daily cleaner then a weekly hoover with the standard hoover.