Our two nights in Peter's house were fine. The location is really good if you want to visit Lake Tekapo and Mt Cook. Peter and his family were friendly and kind, we received good recommendations from them, like the best way to visit Mt Cook or places where we could have dinner.
It's very nice meeting people who have lived in many places around the world and sharing experiences with them.
About the room, It's a basic room that it's perfect for a short time.
For sure I would recommend Peter's acommodation.