We had a really great stay in Mark's appartement during our 7 days trip in Prague for the New Year.
Even tough we haven't met Mark due to technical difficulties, he was very quick to answer all our questions via email and provide useful advises. He also arrange for a taxi to pick us up at 4h30 in the morning of our departure. From the booking to the check out, everything went smoothly and we only have good things to say.
As for the appartement itself, it is centrally located, quite big, with high ceiling and it is very confortable. The only thing we found a little weird was the bath configuration, but once your use to it, that's ok.
We did almost everything by foot during our stay, from the Prague Castle to Old Town, or Petrin Hill. If your a bit less of a walker, there's a tram running in front of the building and the metro station is just a few blocks away.
We would gladly stay here again if we come back to Prague and will definitely recommand Mark as an host for our friends or family who wishes to visit this beautiful city! Thanks.