Excellent.
You've been deserving of a detailed review by me for a long time, and having recently submitted a Nocturne from Grief, and currently working on one of my own, this one is really up my alley!
The piano sounds wonderful. I can't really tell if you played it live or just sequenced it really well, but it's very nicely loose, a lot of pensive pauses and delays, it drags the listener right along.
The composition is good - typical Romanticism most of the times, sometimes a little hint of pop music (add9 chords and such). The theme is well-constructed, the listener "understands" it immediately and will recognize it in the variations as well. Still it doesn't sound generic or predictable.
However, it would have been nice if you varied more in the left hand - after a while I started longing for a break from the arpeggiated chords.
A break which I eventually got in the interlude part at 2:01 - I thought that part was the best, it broke the mood in a real nice way and was just beautifully composed. I wish you had lingered on that a while longer, from 2:31 you seemed a little eager to get back to the main theme, which resulted in what I experienced as an 8 second modulation rush :)
Also, that right-hand part in the intro is really good, you should consider using that technique for another variation on the theme, give it that Chopin feel...
Overall, a 5 and a download well-deserved. Last advice I have is to check out what Simon_F wrote in his review for my "Notturno", it's downright encyclopaedic and you're bound to learn from it!
(Oh, and you may like the tune, as well)