I am just back from 5 days at Nancy's condo in Cancun. The condo building and amenities were great - pool is large and clean, and well set up for kids with a shallow area and a nice ledge. The beach was well groomed, and the water is clear and warm, although it stays very shallow in the swimming area. The convenience store downstairs was a nice touch for little odds and ends that you may need along the way.
The area is great - there are wonderful restaurants within walking distance. We had the Italian across the street (Fontina) which was delicious and super family-friendly, Carnitas Michoacán just down the street, and Hijos de la Tostada which was a bit further of a walk but well worth it - the food and ambiance there were lovely. Proximity to town and the airport are great. There is also a really nice paved running path along the main boulevard.
The condo itself is small but clean. I was traveling with my 2 boys, so it was fine for the 3 of us. Stocked but not a lot of extras, so the convenience store downstairs was handy when we needed dishsoap, toilet paper, water, etc. Wifi was fast, and there was a nice selection of beach reads. Everyone was super helpful, and Nancy was responsive when I needed her. Overall, we had a great time and found the condo to be great value.