I think it really depends on the horse/rider combo. I think that he does sound like the right horse for you though, you've been riding a year and IMHO are still a beginner, and he sounds like he is a good lesson horse but still enough life for the two of you to advance together. However, if you were beginner/intermediate looking at a 25-30 y/o that does W/T only, no I don't think that would be a good match - not to say the horse would be "too easy" but I do think you'd advance beyond that particular horse quite quickly.
I believe there are some horses that are just that - lesson horses, the W/T (maybe some canter) plod along beginner type horses and that is their only gear, there is nothing left to fine tune and they are best being a lead line or plod along horse. Then there are the lesson horses that are good for the riders who have got their basics down, still plod along when the time is right, but also able to keep up with a rider that is heading toward "intermediate stage". On top of that, you then have the horses that would be for advanced riders only, and likely not suited to a lesson program as they are simply not versatile enough to be considered for such a job.
My younger mare (I keep saying 'younger' as if she is still a baby, it is bittersweet to me but she is nearing 10 now) is the latter of the two. She will plod along all day and babysit her beginners, or can stick an intermediate on her and she will be "point and shoot" for them, but she also is the type of horse suitable for a professional to go show at the A shows for a week. I always say that she will be my kids first horse once her show career is done, even though she is nearly 17.3h haha.
So really does depend on the horse, as well as riders current experience/future goals. I think this particular horse sounds like a good choice for you.