First things first,
Has the floor been sealed?
If the answer is yes, is the seal in good condition?
Normal cleaning can be carried out using a neutral detergent, as silverclean rightly stated, water should be used very sparingly!
As this floor is in a house, I would recommend that spot cleaning a small area with a clean cloth and a solvent based detergent wax remover be carried out twice a year, this will allow you to see how dirty the floor becomes over time, this should be obvious. Depending on actual traffic, the above frequency could be changed.
Seals to use are solvent based seals, or you can get water based seals for wood.
Waxes, if the floor has been correctly sealed, you can use a water emulsion or solvent based wax. If unsealed you must use a solvent based wax.
Do not under any circumstances try to sand this floor, as silverclean has said these are extremely expensive floors!
If you are in any doubt, get a specialist in, or ask your chem supplier to visit the property with you and advise on correct maintenance.
Regards,
Rob