This was a great experience overall! Kadek met me at the well-known Alchemy Cafe, a local raw food institution, at the appointed time. Because I had a lot of baggage she got the other helper from the house to come too, and between the two of them they got themselves, me and all my bags on their two motorbikes. The property is about a 10-minute walk from Alchemy through the rice fields - further than I had thought, but I came to enjoy the walk. It's quite pretty and peaceful (except for motorbikes passing on the narrow path) and there are 3-4 good restaurants on the way.
The place itself was very nice. The main room was a bit smaller than I anticipated, but it was fine. The kitchen is basic but it's nice that it's attached and indoors, unlike many kitchens here. The patio was very nice. The only things I didn't like were 1) The pool is so tiny that swimming is impossible - all you can do is immerse yourself, and 2) There are many, many roosters around the place (belonging to neighbors) so it is hard to sleep past 6:30 a.m., and 3) The a/c for the room is very weak; however, by keeping it at its highest setting continuously, the room was a very comfortable temp for sleeping, and there is also a ceiling fan. However, if you prefer your a/c stronger, be advised.
This part of Penestanan is much, much, much more peaceful than central Ubud and in fact many people (including expats) live around here without ever going to Ubud Center at all. Intuitive Flow yoga, a gorgeous studio, is about a 20 minute walk away (you walk to Alchemy and then another 10 minutes further, again through scenic paths. It is a nice walk, but if you want to do yoga frequently, you may want to stay closer to the studio.) Walking to Ubud Center takes 30-40 minutes depending on where you're going, and it's a steep hill back, so you will probably want to take cabs or hire a motorbike. At first I felt too far away being here, but after a few days in the loud bustle with non-stop traffic and wall-to-wall tourist stores of Ubud, I felt very grateful to be in Penestanan. (The other good choice, and an easier walk to Ubud Center, is Nyuh Kuning.)
As everyone else has said, Kadek is an incredibly caring and attentive host and housekeeper. She devised a unique breakfast for me to suit my needs, and one morning gave me a motorbike ride to the place I needed to go. Her English is quite good, and she is a gem. In my opinion it's good to show your appreciation by tipping her well, but she would never ask for or expect it.