Doesn't sound like anything really expensive in terms of parts, under a hundred bucks probably so still a very good deal. Can you do your own maintenance and work, have some tools? That will make it less expensive and also help you know the bike better. Give the frame a good cleaning and that will let you check for any potential cracks.
The stem is reversed - I don't know if the original owner did that to reduce the reach but it is better to flip it 180 degrees and get a stem the right size if needed. If you look at any picture of any bike you will see how it should be fitted.