Here's an opensource self-hosted online RSS reader which is dead simple: https://github.com/tontof/kriss_feed (Homepage: http://tontof.net/kriss/feed/)
And when I say "dead-simple", I mean it: Just drop the single php file and you're done. Yes, it's that simple.
It has all the features you expect: mobile version, keyboard shortcuts, read/unread status, starred items, OPML import/export, customized styles, collapsed/expanded view, public/private reader, you name it. And it's fast.
This is just great and hassle-free. Here are some screenshots:
http://sebsauvage.net/rhaa/images/201303/rha_20130317_kriss_5.png http://sebsauvage.net/rhaa/images/201303/rha_20130317_kriss_6.jpg
This is KISS as I like it.