"Furniture" is an uncountable noun in English, but the Norwegian equivalent is a countable noun. This means that we don't need to talk of 'pieces of' furniture in Norwegian; we simply use the plural form of the noun.
I think i finally realized when to use ''hvor'' for ''hvordan'', whenever you have an adjective after the question word use ''hvor''. Ex: (This sentence), and Hvor gammel er du, Hvor sulten er du.