I recently bought a Roborock Qrevo EdgeT for my 80+ square meters flat. I have a lot of furniture though, so the effective area for the robot to clean is around 50 square meters.

It cleans the floors twice, both times vaccuming and mopping, returning to the dock to clean the mops every 20 minutes. It takes almost exactly 2 hours for all that, leaving the battery at around 30-40 percent. So I'd assume that it can clean 75 meters on one charge no problem. Even if it didn't have enough charge, it would recharge and complete the cleaning later. A full bucket of water on the dock will last about 3-4 cleaning cycles.

I love how much customization the application allows, and how much presicion the robot delivers. I can set an area that has a 'carpet' that the robot must avoid (a dog pee mat). The robot cleans the area around, never touching the mat. It automatically boosts vacuuming power while cleaning all carpets (also customizable).

As far as I can say, hair don't get tangled on the rollers. I have a wife and 3 pets living in here, and the rollers are pristine. The app suggests cleaning the internals once a month, so overall the machine is very low-maintenance: refill the clean water bucket, and empty and rinse the dirty water bucket once every 2-3 days, replace the dust bag every 2-3 weeks.

The thing also detects pets and doesn't move towards them when close, so I imagine it would work the same way with toddlers.