This show is really, really cute and sweet and lovely and makes me very happy. It doesn't crack me up, yet, but I have LOL'd a couple of times and it does make me smile consistently, and that's fine with me.
The actors are all wonderful. (I loved creator QB on Black Lady Sketch show and always thought she had a very natural quality.) The liveliness keeps me engaged throughout. You can sometimes see the comic "twists and turns" coming, but it doesn't make me enjoy them any less.
It may be that after this great show the "documentary" style of sitcom has worn out its welcome, but it works well for this.
And having spent a few years teaching, it seems pretty true - and it makes me miss it.
Heartwarming is a very good word for this show. Heartwarming but not at all cloying. "Delightful" suits it, too.
It's the only network show I make sure to watch every week.