as someone that has been in rentals pretty much their entire life, if you go the carpet, go the darker colours with flecks lol! our landlord in the last place put in this really awful plain blue/grey colour and it showed EVERYTHING. dirt, hair, stains etc. the house NEVER looked clean. much better when you have flecks as it can last across a number of long term leases too (some stains never come out with cleaning but arent worth replacing the whole shebang iykwim). also i know from our experience that we have turned down a lease on a place because it had cream brand new carpet, there was no way that we were going to risk it considering we had a young baby and a dog and 2 cats LOL!

floorboards are really nice and attractive, but like you mentioned a bit cold and also noisy.

that said, if i was in the market to rent i would choose a house with floorboards over carpet just for my own satisfaction of being able to keep it cleaner and avoid allergy problems with my family. but seriously, the rental market here in melbs at least is so hot that there certainly would be no issue in renting it out with carpet lol!