I don't prefer postcards with flowers on them, but this is part of my collections and I have to admit the colours are quite nice. It depicts Geranium "Gustav Emich", Latin name Pelargonium hortorum, Family Geraniaceae. One of the varieties used for summer bedding. The South African Pelargonium zonale, from which modern "Geranium" were evolved, was brought to England in 1710, but it is rarely seen now.
I did a little research and even though I found "Cedar Lodge" Guest House in some local websites, I couldn't find anything that would indicate it is still open.