Within the gardens, there is an excellent minor cottage designed for Queen Charlotte that trumps any back garden shed. You can only go to the palace through Kew Gardens (it’s cost-free with entry to Kew). It’s so well known you could reserve sittings from eleven.30am to seven.30pm every day – https://biggerman.de/mega-menu/reisen/134-wo-in-london-uebernachten-eine-uebersicht-der-stadtteile-und-hotels