He has Impressive in his bloodline. That would really worry me! Make sure you have him tested for HYPP before you take him. There could be another reason why she is giving him away free.
Other than that he is a decent looking horse. And yes he should grow more before he finishes at 7. Not really an english horse though are you planning on doing some western classes with him.
I ride high in the saddle, always saddle my own horse
still I'm every inch a lady from the outside to the core
I take the trail less traveled `cause I know where it leads
I live my life by the cowgirl creed

As for me and my horse, we will ride for the Lord!