Good point about the lifespan, I will ask the present tenants. However, they have kids, who started out as babies in this house I think, and the whole carpet is quite juck. Isn't that a factor? I guess they could have it cleaned, but it is horrible in every sense.
The reason I thought I could ask is that the bedroom already has parket (or laminate). Ok, we will ask nicely of course, but I do not want to move in first and then ask like you had to, because for me I won't take the apartment with carpets, it is that important.
I thought of offering to pay half of the cost, but perhaps that is a stupid idea, because it increases the value of the property and they could ask for more rent anyway? By the way, is laminate popular in Switzerland? It seems much cheaper in other countries than parkett.