We have been using an older desktop machine, which was already a small foot print computer.  The amount of space it requires is very minimal.  I was even thinking of mounting it to either the wall or shelf, but my wife said no.  She's the main user, It's a large upgrade in speed for us, since the old computer is a 2005/6 ish vintage running Windows 7. Doesn't have the CD/DVD drive; don't really need it most software is downloaded these days anyways.  I need to get more memory for the RAM, as it's at minimum quantity to operate.  Very Happy with the machine looking into possibly buying a second machine too.