This is one of those services that doesn't make sense to me as a mobile first & only product(for now).
If you are home and see that your house needs to be cleaned, you are probably near a computer. This isnt like Uber where you need to use their service across town. They have just alienated a bunch or their potential user base by just being on iOS (for now, ok whatever). But that's just me.
Here is the link to the app in itunes: http://itunes.apple.com/us/app/get-maid/id561621297?mt=8