Which version of the show is your favorite?
Season 1 - Lucy and Vivian and the kids prominently used in plots with the Harry character seen semi-often as Lucy's boyfriend/neighbor, like a standard domestic sitcom format
Seasons 2 & 3 - Lucy, Vivian and Mr. Mooney with the children used much less during S2 (compred to S1) and rarely seen at all in S3, and the Countess standing in for Vivian in some eps during S3
Seasons 4, 5 & 6 - Lucy and Mr. Mooney (without Vivian and the children) and Mary Jane (or another costar such as the Countess, in S4) sometimes filling as as Lucy's close friend, with a new celebrity guest star almost every week, similar to a variety show
My favorite is Season 1.