Staying at Rena's place for my first visit to Prague was fantastic. Both Rena and Hearn made me feel welcome and went above and beyond as hosts (Rena came to the studio at 8pm with a plumber to fix a dripping tap!)
The accommodation is in a really lovely part of Prague. It's quieter that the main central part, but I preferred this. The accommodation was approximately 20 mins walk from Praha hlavni nadrazi train station, and about 30 mins walk into the main sites of Prague. There are lots of really unique bars, restaurants and cafes in the area, with a lovely park approximately 10 mins walk away.
I would definitely recommend staying at Dance Lab if you ever have the opportunity to. It was a perfect base, with a lovely, personal feeling to it and hosted by good people.