I've had this one person that's really hard to please on my fic too...
Yours sounds to actualy want to help you out and give a real critic, though some of it seems a little trivial... I donno how you should respond to it, but do be nice about since they took the time to actaully review... and be sure not to take their words to heart oo much on the negative side... Focusing on the negatives realy mess up your writing flow... I know it has for me...
I've never been a HUGE fan of A/N but recently I've grown to respect them. I personally respond to al my reviewers to let them know that I appreciate the time they took to read and review. Whenever I've commented I'll get really upset that no one cared to even say thank you, it's like the writer is ignoring me or something... You know?
Now my A/N is getting a bit long, specialy for my last chapter, but I'm not going to take it off... And I know it can mess up the flow of the story, but that's why I put ~End Chapter~ at the end of the chapter with a few returns after to give the A/N it's own area away from the actual story...
I hope that helped you out some!
Much Love,
Becca