Karbouzi is one of a few favorite restaurants of my boyfriend's parents, and as a result we go there often.
The ambiance here is pretty predictable - it's basically exactly what you would think if you thought "Greek restaurant". It's a well lit place - not a romantic dinner spot - and is definitely family friendly (unfortunately that means there are often young children there, which is not my favorite dining atmosphere!).
The food at Karbouzi is actually pretty decent! We typically order a hummus to start, and it's creamy and delicious - the best part is the warm pita! There are quite a few great dishes on their menu, their ribs are delicious and I'm quite partial to the chicken souvlaki dinner (mmm, tzatziki!). They also have great soup specials - I've never had one I didn't like!
The best part of Karbouzi though, is the unbelievable service. I will note that going with "regulars" might skew my dining experience a bit, but they are just so friendly and fabulously attentive. They remember everyone's name and drink order, they always remember how people like things ("no carrots in your soup, right?") and are conversational without being intrusive.
Karbouzi is an uptown gem. Definitely worth checking out!