[doorknocker]

I think the room is very important for ANY recording, even micing a loud Marshall stack but it becomes incredibly important when recording very quiet instruments like clasiscal guitar. On the bonus side you might use a very lively sounding room as there's less danger of reverb clutter with a source like that.

My advice would be to:

a) find the absolute best room for the recording.

b) spend a lot of time finding the right mic position

c) Keep things as simple as possible. Try to find a natural mix between the direct and reflected sound and mic from there. You probably want to use a stereo mic or mic pair but personally I would even do it in mono but that's just me.

d) When everything is set up in a satisfactory way, simply get out of the way...literally. It might be a good idea to 'hide' somewhere with the equipment so that the player will play in a 'natural' enviroment much like in a recital.