My husband and I, and our four boys (11, 8, 6, 3), stayed here for a month in February 2016. We liked that it was central to many activities: volcanoes, beaches, waterfalls, rainforests, ziplines, and museums were all within a 1/2 - 2 hour drive. We also liked that it was right in the middle of "the real" Costa Rica. We spent a good amount of time in San Isidro and Conception exploring local Costa Rican culture.
Despite the dozen or so day trips we made all around the country, my kids always tell people that their favorite part of Costa Rica was the farm we stayed on. The farmhand's son (about their age) played with them and taught them how to make a wooden swing, a bow and arrow, and an animal trap (they didn't catch anything), and he showed them how to swing from vines in the forest. They called the forest and the stream "The Maze," and they made a whole world in there - trading posts, a hospital, a hut, and a play area.
The horse was a novelty, the three dogs were their best friends, the pond was full of frogs, and the kids ate bits of lettuce, kale, cherry tomatoes, and fruit all around the property. When we weren't adventuring around the country, they had all the adventure they ever wanted right at home.
That said, there was a large storm when we arrived that knocked out the power for a day, and the internet for a week. This wasn't disastrous, but it did cost a lot of money (and it was a hassle) to use cellular service during that first week. Not to mention we had to delay work projects for a week. After it was fixed, it was very reliable. We used it for (SENSITIVE CONTENTS HIDDEN)ing with clients back at home without a problem.