"Jak čistý byl ten hotel, v němž jste bydleli?"

Translation: How clean was the hotel in which you were staying?

[SteveWildones]

Yes, this is the english translation I like to see!

[Daku_]

Proč nemůže být How clean was the hotel in that you were staying?

[VladaFu]

Musí tam být zájmeno, kterým se dá ptát.