Die Pension Hubertus ist preiswert . Diese preiswerte Pension liegt ausserhalb der Stadt.
Predicate adjectives are the easy ones.
They take no adjective endings. Attributive adjectives are a pain in the neck. They signal the gender, case, and number of the noun. That is becasue the genetive case is signaled by the noun, which ends in s . 2. They do NOT signal the gender, case, and number of the noun.