That is a "junior" (child's) bike and won't fit you unless you are the size of a child . . .

Measure your bike inseam and determine your desired bike size.

When looking at vintage bikes, avoid steel rims, cottered cranks, French bikes. This is partly for performance reasons and partly for ease of maintenance and repair. I'm assuming you simply want a bike to commute on, not a hobbyist project.

Be aware of the cost of servicing and overhauling a used bike. Call your local bike shop and ask what it costs to tune-up or overhaul a used bike. if you don't do the work yourself, think about $100+.

Think about what you need in a bike. Fenders? Rack? Upright bars? Always cheaper to buy a bike with accessories, than to buy accessories separately.

Consider the terrain and your fitness, and what gearing you will need.