Not gonna lie, when I clicked at this my immediate response was, "Oh no! A character introduction!" and I almost hit the back button. Character introductions tend to be very bad signs. If you need one then it tends to mean that you've got a lot of work to do, show don't tell.
You actually didn't need that introduction. Which was a really nice surprise. :D You could completely delete the entire little paragraph without having to edit your fic.
In my opinion, and this is only my opinion so do what you want with it, the BEST reader-inserts are the ones that can both avoid giving the reader character a name and description without including blanks. You pulled it off nicely in this one-shot. You actually didn't need to give the reader-character a name at all.
Now that my bit of critique is over, I'd like to say I enjoyed this quite a bit. The beginning where the reader-character decides to just leap onto his bed is rather amusing and I LOVED the idea that she was doing some snooping while she cleaned.
So yeah, the character introduction made me wary but I ended up really enjoying this!