A coffee table makes the most sense if your living room actually gets lived in, feet up, drinks balanced, a puzzle half finished for three weeks. If your space is tiny and you're already doing the dance around an ottoman and a side table, think twice, you might just need a tray on the floor or a stool that pulls double duty. Big open living rooms with a proper seating arrangement, this is where a coffee table stops being furniture and starts being the thing everyone's knees are grateful for.
Before you buy, check how it sits when you put weight on one corner, lean on it a little the way a toddler or a tipsy guest eventually will. Look underneath, at how the legs meet the top, whether it's actual joinery or just screws into particleboard dressed up with a nice photo online. Open any drawers or shelves twice, because the day it gets delivered is the day you find out the drawer sticks or the glass top has a scratch nobody mentioned. Run your hand along the edge too. A good edge is rounded enough that you won't catch a hip on it at ten at night when you're half asleep and the lamp's off.
The difference between a table that's a pleasure and one that's a disappointment is almost always in what you can't see from a listing photo. Solid wood with real joints, dovetails or mortise and tenon, feels different the second you set a mug down, a dull, settled thud rather than a hollow rattle that makes you wince. Veneer isn't automatically bad, plenty of nice tables use it well, but it should be thick enough that a coaster ring won't go through to the particleboard underneath in a year. Metal legs should feel properly bolted, not wobbly where they meet the frame. And the finish matters more than people think, a good lacquer or oil shrugs off water rings, a cheap one clouds up the first time someone forgets a coaster, which someone always will.
Wood ones age the best, honestly, picking up small dings and a bit of warmth over the years that somehow make them look more like yours rather than less. Wipe spills quickly, oil a wood top now and then if it starts looking thirsty, and don't drag it across the floor, lift it, your back and the legs will both thank you. The best ones develop a kind of patina you couldn't buy new if you tried, a slightly worn patch right where everyone naturally rests their feet.