In the uk there is a shop called able world (household aids for the disabled) who have a version of a well known piece of lot which name evades me that let's people in wheelchairs (although it works for any chair) have their hair washed at a kitchen sink.
The bad points are traveling, but unlike many mobiles in my area I was at a par or even more expensive than salons and atleast triple the other mobile stylists rates (it's a luxury for the client to have me go to their home, and their convenience so I'm going I charge them that too).
The worst part is clients who's home hygiene standards are much lower than yours (dirty knickers all over the bathroom floor, skid marks in the loo, pubic hairs in the bath, kitchen cupboards, worktops and walls around cooking and prep areas that haven't been bleached that day). The best parts, you don't have to have to stay in one place, if its a quiet day, as long as you have your phone you can go out and still get bookings etc... Xoxo