The room at Penny's home is just as described - like staying in a tree house. The room was bright, clean and quiet. The bathroom was stocked with everything you could need and the towels were quality.
Penny's home is in an ideal location. There are shops and restaurants of every cuisine imaginable withing walking distance.
The only warning is that we found the mattress too soft, but that may be a personal preference. That aside, I would recommend Penny's home for your next stay in the Boston area.