The honest short answer
An Andalusian can be a good first horse, but only a particular kind of Andalusian. The breed, Spain's Pure Spanish Horse, was shaped over centuries as a mount that had to be brave, agile and deeply responsive to its rider, and modern Andalusians still carry that wiring. A settled, well-schooled adult tends to be sensible, people-focused and forgiving of small mistakes. A young, sharp or barely started Andalusian is strong through the neck, quick to react and fully capable of unsettling a novice simply by being powerful. So the breed label is not really the question; the individual horse's age, mileage and manners are.
What you are actually buying
Most Andalusians stand around fifteen to sixteen hands, with the breed's trademark arched neck, deep chest and long, thick mane and tail. They were built for collected work, which is why so many go on to classical dressage: they learn patterns quickly, they are genuinely intelligent and they seem to enjoy having a job to think about. That intelligence cuts both ways for a beginner. An Andalusian notices everything, a new banner on the arena fence, a rustle in the hedge, and takes its cue from the rider's body. A calm, balanced rider gets a calm horse. A tense rider who grips with the knees and hangs on the reins often gets a tense, jogging one, not out of naughtiness but because the horse is answering exactly what it feels.
The match that works for a novice
The Andalusian who suits a beginner is usually an older horse, often in his teens, who has already worked as a riding-school, hacking or amateur dressage mount and has seen the world. Ride him more than once before deciding, ride him in the arena and out on a hack, and have your instructor ride him too, because an experienced trainer can feel within ten minutes whether a horse's reactions will stay inside a novice's ability. Plan on regular lessons from the very start. With a sensitive breed, lessons are not an optional extra; they are the mechanism that keeps the partnership safe and makes it enjoyable, teaching you to give the quiet, consistent aids this horse responds to best.
Day-to-day life with the breed
Daily care is unremarkable in the best way. Most Andalusians hold their condition readily on forage with only modest hard feed, and they are generally sturdy horses. The glamorous mane and tail are the real time cost: thick hair tangles, picks up bedding and shavings, and needs patient detangling with fingers rather than being ripped through with a brush. They are social, people-oriented horses who do best with turnout, company and a steady routine, and because they read people so closely, handling should stay quiet and consistent from everyone who leads them.
Before you say yes
Ask for the horse's history in writing: previous owners, the work he has done, and any quirks with traffic, clipping, loading or shoeing, and arrange a pre-purchase veterinary examination before you commit. Take a trial period if the seller allows one, and be honest with yourself at the end of it, because admiring the breed is not the same thing as enjoying the daily ride. When the sale does go through, KinsLe's Transferrable Profiles lets the horse's records, routines and history pass straight to you, so everything you worked so hard to gather never has to be reconstructed from memory.