One Room, Hiatari Futsuu, Tenshi-tsuki.

Shintaro Tokumitsu is a student who lives alone in a small studio apartment... at least he does until one day he finds a girls sleeping on his balcony. She isn't just any girl though; she is Towa, an angel sent by god to learn about humanity. His life is about to get interesting as he starts attracting more supernatural girls.

I thought this series was rather fun, in a light hearted way... the type of show one enjoys while watching but are unlikely to watch again. The characters are fun and varied and for a harem show there isn't too much fan service. The character designs are suitable varied so one won't confuse who is who even if they look similar to those in most modern series. Overall worth a watch if you are a fan of the genre.

These comments are based on watching the series in Japanese with English subtitles.