I rarely rate series with a 10, even when I really enjoyed them, but I feel like this one deserved it. The only flaw that I can think of is that it's shorter than I wished it to be, but other than that it's very, VERY good. The relationships between the characters (not only among love interests, but also with friends and family) are portrayed very well, and even better- it was clearly SHOWN instead of being TOLD, which is something that many series get wrong. At no point I felt lost wondering what did the characters feel or what was going on, even when nobody was putting it all into words. The character development is also very good and well-paced.
The music is an element that I usually don't care about all that much, but this time around the songs were just too good to be ignored. I also appreciated the fact that music in this series is an actual passion for some characters and not just an aesthetic used for a couple of romantic moments.
The chemistry is very good, and let me specify that I'm talking about actual chemistry and not kissing scenes (if you're looking for those and nothing else, then you should just look elsewhere). The protagonists seem sincerely fond of each other, and the same can be said for the second couple.

It's a short series, so it might be a good show to watch when you have a few hours spare to binge-watch it. It's heartwarming and moving, definitely a gem!