My husband and I spent a week at Plum Cottage, and had a great time! The cottage was spotless on arrival, and was very well appointed. The neighborhood is very quiet, you'd hardly know you were just a couple blocks off South Lamar. My husband and I went for a couple of runs while we were there just around the neighborhood and it was a quick 5-minute drive down to Lady Bird Lake to run there, as well.
Unfortunately, it rained pretty much the entire week. This isn't a problem related to the cottage, but as we were expecting to spend quite a bit more time in the great outdoors, it did get a little cramped inside for the two of us and our dog. We weren't able to spend any time in the backyard or on the back patio, which was unfortunate.
Our only recommendations would be for the owners to pick up a couple extra (larger) cutting boards as there was only one and it was pretty small, and also a set of steak knives. Other than that, the kitchen was very well-stocked...had everything we needed. The coffee pot worked great and they had a variety of teas (and an electric kettle!) and regular coffee (pick up decaf if you're a decaf drinker!).
Plum Cottage is ridiculously convenient to just about everything...Trader Joe's, Whole Foods, Target, Central Market, Shake Shack (park in the Alamo Drafthouse garage), and all the fun of SoCo and the food trucks on South First. We'd planned on hitting Zilker Park and maybe the Barton Springs Pool (both also crazy close to the house), but I guess those attractions will have to wait until our next visit!