Their body really is a middle ground between Humans and Elves. Most of them do not have any body hair, some have slightly pointed ears, others do not. They can see in low light conditions and have keen senses.
Here too, they are an in between. They cannot live indefinitely, but they live much longer than humans. Their maximum lifespan is about 400 years.
Most will be raised or decide to live in the human world, because elves in general, look down on half-breeds. Some fortunate ones will get to live and be integrated within elven society, but this is rare.
The main problem is the parents' longevity discrepancy. Most of them will be happy for a time, but age soon catch up with the human partner and sadness ensue.