Our stay at Bill's Villa at Casa de Campo was in a word: phenomenal. Even prior to the stay, Bill was extremely communicative (providing clear directions and instructions, offering recommendations on transportation / restaurants / etc.) and kind. The villa itself was just as described - clean, offering multiple indoor and outdoor spaces, having working AC units in the bedrooms (with bathrooms attached to each), and with a fully heated plunge pool that we enjoyed tremendously (to note, there were 2 of us staying in the home for the week). A golf cart at Casa de Campo is a must, and it is certainly a perk of the stay at this villa that one is included (~5-7 minute ride to the Marina with plenty of gorgeous villas to view along the way). Perhaps most importantly, we were so warmly welcomed by Zeneida (who helped to clean, shop, cook, guide, and even brought us fresh fruit from Romana) and felt right at home from the moment we arrived. She is a rockstar - extremely kind, willing to help, able to adapt to guests' needs.
Overall, I do not have enough positive things to say about our stay at Bill's Villa, and hope to be able to return soon. For those who have not stayed at Casa de Campo, the grounds too are wonderful with plenty to do (and Bill can / does provide some great suggestions) and see.