Mark was a great host. The space was clean and had everything we needed.
The only thing I would warn others to consider is whether they will really like sharing an apartment with 3 other sets of people. In my case, having others out in the hallway (light sleeper), the inability to adjust the temperature, and having to tiptoe around others in common areas was not worth saving a little money. But that's just personal preference! Outside of that, our stay at Mark's was great!