*Note: I have not read the manga.
There were some holes in the plot here and there, but I thought the story was a little above fair at most. It was a cute plot, definitely meant to just make us smile.
The art quality was good, nothing disturbing to see. I especially loved the appearance of the two main characters -- so kawaii!
There was hardly any background music, but it's a hardly noticeable flaw.
Since it's just a one-episode OVA, we can't really expect any character development. Both characters had cute personalities, but Uehara (the main guy)'s attitude kind of seemed inconsistent.
I loved the cute-sy feeling of the overall episode. I smiled a lot throughout watching it.
If you're just looking for a short anime that will lift up your spirits, then you should give Good Morning Call a try.