I saw a link to this on one of the Ghosts threads earlier and I've binged watched 6 out of 8 episodes this evening.
It's about a woman who discovers a ghost lives in her apartment. But it's from 2010 so it predates Ghosts by quite a few years. It's very different to Ghosts as it's a dark comedy / drama. And it's ace!
Matt King aka Superhans plays the ghost. The main female actor also wrote it so is clearly very talented. It's got a brilliant plot and is beautifully made. Not for kids.
I'm watching it on Amazon Prime and I highly recommend.
(Im mesmerised by Matt King's eyes. His pupils never seem to dial age and they are so so BLUE!)