Anzan is certainly a beautiful spot and the views are unobstructed and absolutely gorgeous.
That being said, we were not prepared for how remote the place actually is. You are on the lake and there is no access to a convenience store or restaurant so I would recommend bringing some food and supplies for the room. The closest town is San Marcos, which is not the nicest town in Atitlan and is a bit hard to get to, especially at night.
The room has some ants and scorpions, which is normal with such a remote location but beware if you don't like bugs. The towels were a bit old and had some stains.
The breakfast was absolutely delicious and fresh and so was the one dinner we had there. Be aware that the restaurant is not open on demand, but you have to make a reservation with the owner Dita in advance. You will likely have to fetch your own lunch and dinner on the nights where you don't have dinner reserved. This means you have to go into one of the neighboring towns.
Overall, this is a beautiful spot but some of the details were lacking, especially given the price. We expected a more refined experience and it was more rustic than expected.