Villa Sumer is a beautiful and well equipped house, in a stunning location, just 20 minutes out of the city of Palma. The location is extremely quiet, but you have a small town just on the doorstep and beaches and clubs a short walk or bike ride away. It's easy enough to get a bus (or taxi) in and out of Palma, but families might find it easier to rent a car from the airport.
The photos in Tripadvisor don't really do justice to the views, and from the house you get both lovely sunrises and sunsets (take your camera!) and during the day the bay is a stunning blue. There are lots of photo opportunities in the neighbourhood, but equally all the beaches in Mallorca are stunning, so it's not hard to say this!
The house has obviously been used as a family holiday home over many years and so it has a ton of trappings for keeping kids (and adults) entertained. There is a mountain of boardgames and books, large TV, and fast broadband (another reviewer commented on the broadband, but I think the house was upgraded to fibre internet since then, so it's now super speedy).
I personally really liked the layout of the house. Effectively the house easily separates into multiple areas, so it's not too hard for people to find their own space. Outside as well you have both a balcony, the main pool area, the front of the house and also an upstairs terrace (great for sun-downers), all of which allow kids (or adults) to slope off and find their own space.
Disclaimer: I have visited Villa Sumer twice now and have arranged a third visit later this year!