I took my 6 year old to stay at Finca arrieta not having been to Lanzarote before. We loved it. The place was easy to find, and thoughtful touches such as milk tea and coffee (and fizz..) on arrival were really welcome especially as we arrived late on Sunday.
The yurt was comfortable and the kitchen had everything we needed. The kids play area and pool area are perfect and I'm looking forward to a return trip. The only downside I can think of is that you have to cross the road to get to the beach. Oh and it's windy, but then it's a windy island and that's also a plus point in that it keeps the temperature down.