First and best FF I ever played ( for me of course ) ... it was my first rpg and thanks to it I am now a big fan of all FF games ^.^
I think the story was very well written with amazing main characters ( cloud, tifa ... ) and a big antagonist : Sephiroth !
The music was all perfect for me ( Nobuo Uematsu did a wonderful work ! O.O ) and all the places like Nibelheim, Canyon Cosmos, Midgar. The past of all the characters too was very well designed ...

I love FF7 <3