。
Is it just a short walk?
Literal
Walk-and immediately is (polite)?
歩いてすぐ ('walk-and-immediately') as an idiomatic fragment for 'a short walk away,' here turned into a question by closing with the polite か. すぐ does double duty as both temporal ('right away') and spatial ('right near'); context picks the spatial reading here. Closing with か turns the same fragment into a polite question with no need for a separate verb of asking.