I stayed here with my parents and brother and it was more than enough space for all of us. Two people can sleep comfortably on each of the beds. The kitchen is really nice with all amenities available - coffeepot, kettle, stove, pots, microwave, etc. Karen was kind enough to leave some fruits and water for us in the fridge upon arrival.
The hosts are very kind, we had a very late arrival around midnight-1am and Karen had kept the sofa bed out and ready for us in consideration of this. She gave us a 7 page document of things to do in the area and instructions are very clear for check-in and check-out. She was also kind to let us use her washer/dryer and detergent.
The space is designed really nicely, very neat and clean. The house itself is in the Madrona area, only a 15 minute drive to the downtown area. It was close to everything and there are a lot of nice restaurants nearby as well! I highly recommend people to stay here, it was definitely well worth it.