We never met Mark in person, but he was very helpful and answered all of my questions quite quickly! The apartment is clean and very close to buses and the metro, and there are a lot of cafés and supermarkets within a 2 minute walk.
Only down side was the bathroom, which outside of the apartment, not very practical and pretty cold! I'm sure in the summer it must not be a problem at all, and even in the winter it's ok for shorter stays. Just something to take into consideration, and it didn't stop us from enjoying our stay!