The thing nobody tells you about small cabinets is that the word "small" is doing a lot of lying. A cabinet that looks neat and compact in a showroom or a photo can turn out to be eighteen inches deep, and suddenly it's eating half your hallway. Measure the actual floor space, not just the wall, before you fall for one. That said, a good small cabinet solves more storage problems than almost anything else you can fit into a tight room, and it's worth the hunt.
On color, I'd steer toward mid tones and natural wood finishes over anything stark white or glossy black. A warm oak or walnut veneer hides scuffs and dust in a way white lacquer simply doesn't, and it sits comfortably whether your room leans modern or more worn in and lived with. Soft sage, muted blue or a chalky off white work too, as long as the finish is matte rather than shiny. Shiny finishes show every fingerprint and every ring left by a mug, and in a small piece that gets touched constantly, that adds up fast.
Where it goes matters as much as what it looks like. A small cabinet with a lot of visual detail, carved fronts, ornate handles, strong grain, can fight with a room that already has a patterned rug or busy tile nearby. Keep it plain if the room around it isn't. And be careful putting a delicate looking piece somewhere it'll take real daily impact, like a mudroom or behind a front door that gets kicked open with an armful of groceries. Thin legs and light frames aren't built for that kind of knock.
When you're looking at one in person, or standing over it the day it arrives, open every door and drawer slowly and listen. A good one closes with a soft, slightly weighted clunk, not a hollow rattle. Push on the top corners and see if it rocks even slightly, that tells you more about the frame than any spec sheet. Check the back panel too, thin hardboard backs tend to bow over time if you stack anything heavy on top. Hinges should feel stiff enough to hold a door half open without swinging shut on their own.
The drawers are where cheap pieces give themselves away fastest. Pull one all the way out and see if it still feels steady, not like it's about to tip forward into your hands. Good runners glide with a bit of resistance and a quiet sound, not a screech or a dead silent slide that feels flimsy. A drawer that already wobbles in the shop will only get worse with daily use.
Would I be happy opening this thing every single day for the next ten years, or am I just liking how it looks standing still?