Most people buy the dining table last, after the sofa and the rug and the art, and then wonder why the room never quite settles. Wood grounds a space in a way glass and metal just don't. It is the piece everyone leans on, literally, elbows and all, so it is worth thinking about before you think about anything else.
If you own nothing yet, start with a solid round or rectangular table in a mid toned wood, oak or acacia, something with visible grain rather than a flat painted finish. It reads warm without screaming for attention, and it will sit happily under whatever chairs you end up with, mismatched thrifted ones, a set of six, a bench on one side because you ran out of budget. That flexibility matters more than people expect. A table in a loud finish locks you into one mood for ten years. A honey or walnut wood lets the color story happen around it, in the chairs, the pendant light, a runner down the middle, instead of fighting it from the center of the room.
For fit, measure the room empty, then add the furniture back in your head. You need at least three feet of clearance on all sides so chairs can pull out without hitting a wall or a sideboard, more like four feet if people need to walk behind a seated guest. A table that looks modest in a showroom can swallow a small dining area whole once six chairs are tucked around it, and a table that looks substantial in a big box store can look lost and spindly in a real apartment. Measure the actual footprint, length and width, not just the seat count the listing promises, because "seats six" sometimes means six people who really like each other.
When you see it in person, or the day it arrives, run your hand flat across the top before you decide you love it. You are checking for smoothness, no rough patches that will catch a tablecloth or scratch a glass, and you want a finish that feels sealed, not raw, so wine rings and hot mugs don't become permanent decisions. Press down near the edges and the legs, nothing should flex or creak. Knock on the surface with a knuckle, a dull solid thud means real substance, a hollow rattle means you are paying wood prices for something that is mostly air.
If I had to pick the first finish to bring home, it would be a warm walnut. It holds its own, it photographs honestly rather than flatteringly, and it gives you somewhere real to start.
