We are a family of 4 (one child then 3 1/2 and the other roughly 6 months old) who spent a week in Germán's apartment in autumn.
All in all, we were happy here: It's indeed quiet but well located to reach from the airport and get everywhere on the island with a rental car or the fantastic bus connections from Alcúdia. The pool is among the best we've ever seen, it's enormous and has a large non-swimmers area; unfortunately though it's not heated and as the apartment building is L-shaped facing North-East, in autumn the water was too cold to still go in. I can imagine though that it's fantastic in summer as there will be some shade from the afternoon onwards. The apartment layout is ideal for a family: There's a large kitchen-diner-living-room (TV with two Spanish kids' stations), the kitchen is equipped well enough for your odd simple family meal and breakfast, and both bedrooms as well as the bathroom are large enough to do the job for 4. A nice touch is the crib that's available for younger children. Also, communication with Germán was outstanding, he always replied within a very short period of time with clear information. :-)
Unfortunately though, the apartment feels MUCH older than the pictures imply. The pictures certainly are a few years old already as there have been major changes in the meantime: E.g. the bidet has been replaced by a washing machine (that's not a minus, as we wouldn't use a bidet but appreciate a washing machine in the apartment). So while the view was even better than in the pictures, the entire apartment and apartment building feel a little run down by now. That certainly was added to by the fact that cleaning certainly isn't perfect: The dishes had just been done with water and were still greasy when we arrived, the entire kitchen could do with a major cleaning. We were also unsure whether the linen had been changed since the last guests were there. We certainly can't tell it wasn't, but it didn't smell fresh either as it does in other places.
Lastly, as to the "family-friendliness": Our kids were in the right age that we could make it work out: The old one being old enough to understand dangers, the little one still being to little to be absolutely mobile. However you should know that none of the power outlets are childproof and there are lot's of little things easily accessible especially in the kitchen and TV area, so you'll have to keep a special eye on kids in some ages or will have to move a lot of things first. Also, the main door is secured from roughly around 11pm. That adds to security of course and you will have a key code, the problem with this is that the secondary door will be locked and you won't have access to it anymore and ONLY the secondary door is barrier free. We were in town with grandparents and were out to eat late one night (around 10:30, so much earlier than the lock-up time published in the building because we wanted to avoid not to be able to use the ramp) and had both kids sleeping, one in a carrier, the other in a stroller, which was impossible to get up the stairs to the main door without waking the child as we couldn't use the ramp door anymore. Now, it sure won't be every night that you'll be coming in late with kids, but you should be aware of this.
All in all, value was fantastic and we were generally happy to spend a week here, but you should keep a few things on your mind, especially when visiting as a family, and don't expect the apartment to look exactly like in the pictures.