William
I've worked as a two man team for quite a few years-it's the only way of fitting in all the work generated.

(That or I can finish the day's work in half the time-depending upon how you want to look at it.)
Working in domestic situations presents no problems-we each know each other's duties and can totally inter-change as required. Some clients do comment on the speed ( we have a "routine" for dealing with that as well) but most are simply grateful that you have kept the inconvenience to them down to a minimum.
It's nice to have company when driving between jobs and looking back I realised in my early years just how lonely this type of career can be when you have nobody to talk to about problems.
We also find that simply having a colleage means we can gee each other up which is especially useful when you arrive at your last job of the day-after a really long day already-and you find the EOT is a complete tip-and there;'s lots of fiddly stains-and you find a piece of equipment is not working properly (you get the picture).
Rog