THE easiest plane to hover is a spad. The spa3d or the qhor will hover with much ease. I built my dad one of these and he could never hold a hover for more than 10 sec. With this plane he comes down the runway in a harrier, pops it into a hover, tail slides down for a tail touch and goes back up for a torque roll. He went from not being able to hover to doing all of this on the 5th flight.

If you want a balsa model a UCD will fit the bill.