Start with the good: The location is great. 5 min to La Fortuna waterfall (must see), 5 min to La Fortuna (cute town with whatever you need), 20 - 30 min to hot springs, Arenal, and ziplining.
The house itself is interesting. Lots of artwork to look at, great wood smell, high ceilings, very long pool, nice grounds. We saw several toucans out in the trees while having coffee on the patio. 6-7 people would be comfortable here. It is very secure, and cows live next door.
The place needs a good cleaning and sprucing up. bathrooms were clean, but the toilet seats are loose. Kitchen stove was not clean and we washed all dishes before use. There is no dishwasher. Kitchen equipment is sparse (one pan, a few pots, old coffee maker) but we made it work.
Check-in was... OK - after an arduous car trip from Quepos (everything you've heard about Costa Rican roads is true), we missed the 75-minute window to meet the property manager there, so we had to drive into La Fortuna to get the key and find out which gate led to the house. She was very nice and was in continuous contact to make sure everything was good. The host was responsive to my questions after booking.
Word of warning - the only room with AC is the master bedroom. That was tolerable; it was not too hot at night in June, but that might be an issue during hot weather.
All in all, we had a nice time at this property, but I recommend the owners install a dishwasher, clear out some clutter, and have a maintenance weekend.