We loved the stay at Marcus' place. Although we didnt meet in person everything was organized perfectly. Marcus called me a day in advance to let me know he wouldnt be there and exlained everything we needed to know.
The place itself is just like described - nothing more to say, really! Mayb just that it was immaculately clean!! The 18th district itself is phenomenal but you are also very close to everything else in the city!
So all in all: highly recommended stay!