Can you clarify if the valuation for the goods is €21,000 & €64,000 or €2,100 & € 6,400?
My understanding is that you would be liable for the damage to the property as per the 2005 valuation - so to replace a like for like item. He can't charge you for a brand new sofa if there was a 5 year old one there when you moved in.
However, you seem to admit to a significant amount of damage (even the lowest of €2,100 would seem significant), he may have become aware of other damage to fixtures and fittings and/or the property not immediately obivious (plaster, walls, flooring, doors, plumbing) and he may have a case to follow you for this.
What damage were you aware of?