food: because it's fine dining, the portions are obviously small, but i found the 8 (first 3 shared) course menu to be filling. i thoroughly enjoyed tasting new flavours and combinations ("egg hunt" was cute)
service: friendly and attentive, staff gave explanations of each dish. if you are celebrating a birthday or anniversary, let the staff know (we got asked, though) and you'll get a slice of complimentary cake.
ambience: dark, relaxed, slightly noisy because of banter competing with music.
overall: i would recommend to try nel at least once for the experience.