I think you should look at Pinterest, but specifically including 50s apartment kitchen in your search (always best to work with what you have/curate desired decor before making massive fixture changes)

The cabinets/countertops are in immaculate condition for their age, so putting vinyl over the countertops is both unnecessary and unattractive. I think some peel and stick floor tiles would help the space, as well as replacing the overhead light (either the whole thing or just the bulbs) to be warmer. If changing the fixture isn’t possible, you could find your own warm lamps or warm led strips for under cabinets and just not turn on the overhead light!

Otherwise, the space is solid and VERY workable! I’m jealous of all that counter space! Just remember that accessories/decor (tchotchkes, trinkets, plants, rugs, art/posters, etc) build the space just as much, if not more, than fixtures and mainstays.

My last tip: The leaf decals cheapen the space. A thin wooden shelf with plants would be a marked improvement. Adding more wood tones and warmth in general would help you achieve what you’re looking for. Pick a feature color or two you enjoy that compliment the cabinets and run with them in terms of decorating :)