We stayed at MV Piece of Pie in July 2014. The house was great for us.
House: The square footage was much larger than we realized. There was ample room to spread out. In addition, the layout of the common areas was good for communication, without impacting folks that may have been sleeping. The front and back porches provided a sunny and shaded spot to relax. We also got to use a recently installed outdoor shower, which was convenient for beach days. The house had all of the kitchen utensils required for cooking/serving. The grill is new, and well maintained.
Location: The house is on a very quiet street. It's a short walk to Oak Bluffs, and the roads taken are fairly low traffic so kids are safe. The bike path is nearby, which can get you to Edgartown. We found it best to drive to the beaches, but biking is also possible.
Owners: Owners were great. They are organized, detailed and responsive. We had 1 minor maintenance issue, which was addressed quickly, without hassle.
Value: We felt that cost for the week was well worth it. We looked for comps, but this place had the right mix of quality, location and price