We stayed at Mary's place for 6 days in June. While we liked the proximity to Venice Beach, the location of the apartment was not what we expected. It was not as residential as we had hoped, as the busy cul de sac was were all duplexes with a lot of people in and out. The unit next to ours was also rented out so the noise level depends on who your "neighbors" are as the walls are thin. Guests the first half of the week were fine but guests the second half preferred loud music.
The unit itself was roomy and nicely decorated. The beds were very comfortable and the ceiling fans in both bedrooms helped keep the unit cool. The kitchen was clean and updated but was missing usable cutlery (dull blades) and useable spoons, forks, knives (tarnished silverware that didn't wash well). The cups were stained with coffee. Also, the dishwasher detergent was something I've never heard of, which left a milky residue after a cycle. Replacing kitchenware and detergent, however, are easy fixes.
Mary was a very pleasant person to work with, making the booking process easy and effortless. I'd say your stay really depends on who you are. We were a family with relatively young kids and found the location iffy. If you're with friends and want to be close to Venice Beach, it may be just right for you.