Clean Sweep is Book 1 in the series.

I became hooked on Ilona Andrews through the Kate Daniels series, then discovered the Innkeeper Chronicles, and my addiction grew. This series has a very different vibe to Kate Daniels, but it still packs the Ilona Andrews punch. There are (at the time I'm writing this) three novels out in the series: Clean Sweep, Sweep in Peace, and One Fell Sweep.
The novels are science-fiction with a dose of urban fantasy. They tell the story of Dina, an Innkeeper who caters to non-human clients. In this universe, the Earth exists on an interstellar crossroads, and humans are the smallest fish in a big ocean. To prevent humanity's inevitable enslavement or extermination by another race, a great treaty was formed to establish the planet as a neutral zone and safe haven. Innkeepers provide accommodation and protection to those who come calling and ensure the great secret is never revealed.
The best way to describe this series is FUN. The blend of science and magic is perfect for the tone of the books, which are action packed, humorous, and touching. The Inns themselves are incredible, and the eclectic cast of characters are delightful (and yet another reason real-life social interactions can feel so tedious).
If you enjoy a fantastical sci-fi adventure, or are an urban fantasy fan looking for a new take on things which go bump, I highly recommend these books. They aren't hard sci-fi, so readers looking for an explanation of how the Inn's technomagic works are going to be disappointed, but that doesn't mean the world-building is lacking, just that the explanation of how magic and technology mix isn't relevant to the incredible stories packed into each instalment.
You can find more information on goodreads here, or buy the books at:

• Amazon
• Book Depository