Start with painting the floors and the rails white if you can, but grey rails or black will work just as well. (I painted the veranda white last year and I barely need to wash it, it doesn’t show its dirt at all and my veranda is not covered. The paint handled snow and rain great too, no peeling ). Cafe style chairs and cafe style table match well with the mood I wanted to create, they are easy to find in any store (mine are from Ellos but check measurements first before you order as they run much smaller than the usual cafe style furniture). Add a garland of string lights ( again you can fine the exact ones at Ellos, they are suitable for outside and they also come in black color) , they give off a French country cafe feeling even during the day! For a clean green look choose all green plants , a monstera and a pilea where the plants of my choice, but mostly I just use the plants I already have in the house.
Bring out a magazine, a cup of matcha tea or infused green water and enjoy an all green clean crisp mood in the comfort of your own home ;)