Mark really helped us out when the flight was delayed by 3 hours, meaning we arrived at Prague airport around 1am! Obviously that was to late for him to stay up, but he managed to organise the keys to be given to the taxi driver so we could let ourselves in. Very helpful, especially given the short notice of the delay.
Apartment was fairly well located, not central, but a pleasant 30 minute walk or so along the river from the old town and 10/15 mins from many restaurants and bars. Room was extremely clean, well furnished with comfortable bed, fast internet and TV if required.
Overall a great experience, we would recommend and come back.