The Keeper Chronicles:
Summon the Keeper (1998, mmpb), #1
The Second Summoning, (2001, mmpb), #2
These are light, clever, agreeably-girly fantasy-romances set in Canada, featuring Claire, a modern-day witch; Austin, her familiar, an elderly, smartmouth cat; Dean, Claire's Newfie boyfriend; Diana, Claire's witchy teenage sister; and the Powers of Darkness!
The first book introduces the characters, who must close a Doorway to Hell in a rundown B&B. I liked it, but it had some slow stretches: "B+".
The Second Summoning moves along more briskly, has more cats, more angst-ridden teenagers, and more laughs: "A-".
Both books are pleasant rainy-day reads, with well-drawn characters, snappy dialog and, well, catty cats. As with all humor, your mileage may drastically vary, but #2 in particular kept me smiling. You should read #1 first.