Petr was very helpful and available whenever we needed his advice. Just perfect! The location is indeed unbeatable as it is very convenient for getting around and just in reasonable distance from the historic city centre with its hordes of people.
However, there are two things travellers should be aware of:
The apartment is in the backyard of an apartment building and the seperating court is very narrow. There are windows, but the only view you get is the narrow court and that is a little weird. We only stayed three nights and were outside a lot, but in other conditions it would have really bothered us.
The second thing is the lack of (storage) space if you are travelling with more than two persons. In this case it's more like camping and one should be ok with mess and cooking & eating inside could become a problem.