Jaroslav's studio is very nice. It seemed to be recently renovated. I found it to be pretty spacious and quiet.
I never met Jaroslav or his friend Katka, but they were very helpful and responsive via messaging. I had an issue late one night, messaged Jaroslav, and it was taken care of by the time I woke up the next morning.
There is a market close by and the building is ridiculously close to the Charles Bridge. I had a very nice stay.