I would prefer to clean my space by myself. Only that is the way to know that the place is 100% clean.
Hiring someone will cost a lot to do it weekly. Plus you will have to be at the place, or trust this person for 200%. And even a pro housemaid can leave a corner unclean or miss some spot. Robots are also something hard to trust. I have one. Sometimes it cleans till its battery is dead, sometimes it gets stuck under the sofa just after I close the door and go to job.
I'm a bit of a gadget geek, but my Roomba is perfect for me. It is set to run whenever there is no one in the house and it returns to its base on its own. I love that I can set it to clean while I'm at work and the kids are in school. No need to pay a cleaning service. I only have to empty the dirt bin on a regular basis.