I quite enjoyed this one. Between having an actually-villainous villainess being genuinely in love, and between having an expressed relationship that goes beyond the service, this is a very solid and satisfying spin on what kind of relationship that could be. Beyond that, it's a fairly vanilla love story - but it's a good one that goes deeper than the average one.
My ratings on the series, from best to worst (with lines between 'enjoyed', 'neutral', and 'disliked'):
1-2, 7-3, 2-3, 2-4, 6-4, 4-5, 5-2, 6-1, 2-2, 4-1, -9-1-, 5-5, 2-1, 8-5, 1-4, 7-2, 3-2 | 4-4, 6-6, 7-4, 6-5, 7-1, 4-3, 4-2, 3-1, 6-3, 8-3, 5-1, 4-6, 8-4, 2-6, 5-4, 1-5, 3-3, 8-1, 8-2 | 7-5, 3-4, 1-3, 2-5, 3-5, 5-3, 6-2, 1-1