As a straight guy, you might guess shoujo ain't really my favorite genre. Nevertheless, I'm honest enough to admit it when something is well done, regardless of the genre! And this "Good Morning Call" is pretty well done indeed, albeit not being particularly original: there's a naive, pure-hearted-if-a-bit-spazzy heroine, a cold and horribly curt ML who (very) slowly warms to the FL, the heroine's best friend who's too good to be true (seriously, raise your hand if you've ever met someone so perfect IRL, LOL) and last but not least a few more male characters who would all be a much better choice for the FL but of course you know they'll all be friendzoned one after the other.
Still, the screenwriter managed to make this a very pleasant watch by accurately dosing and mixing all the ingredients, adding a lot of funny humor, some brilliant ideas here and there, and some endearing minor characters.
To top it all, the acting is better than average (except for the stone-faced ML whom I found plainly terrible, sorry) and there's some very nice music.
I would've given it an even higher grade, weren't it for the fact that I think 17 episodes were a tad too much, and the last 4 or 5 felt a bit draggy, imho.