Some added information that may be useful (not provided when hovering over these words unlike in other modules)- जमीन (floor) and छत (roof/terrace/balcony) are feminine
I agree. I find Duolingo's Hindi Tiny Cards helpful in expanding my vocabulary along with learning the word-genders.
Since Chat means terrace - and isn't a terrace a balcony? - so perhaps another answer could be "This balcony is very cheap?"