We traveled with a 4 yo (around Italy) and stayed at all AirBNBs. We stayed for a week at multiple places - so it wasn't enough time to settle in AND work. My plan was to put in around 2h / day but even that was difficult to achieve.
Stuff I would look for and confirm with the owners are:
1) If they have a work desk and a chair. Multiple if you have other people also working. Or atleast a decent dining table.
2) Good internet. I think AirBNB now has a wifi speed test result option. However, I would confirm if they have wifi inside of the room.
We stayed in Tuscany (large farmhouse) and they had wifi only at the reception and outdoors but not inside the room. (Was not working there -- but would have been an issue if I was). Always better to carry a wifi dongle. Most countries will now have a company renting these out from the airport -- or you can get a local SIM.
3) Things for your child to do safely around. If you are running behind them preventing them from climbing dangerous things or jumping into the pool, they you can't get work done 🙃
4) Plenty of space.
We had got a studio apartment in Venice which was super tiny. If I had to take a call, it would get really awkward with my 4yo and wife being across the room.