Great place to stay while exploring Prague. The apartment is close to the public transportation and it's super easy to get to the city centre. We haven't met Helena, but everything was prepared for us and she left us precise and detailed instructions. The only thing that was kind of annoying was the parking space. Since it's a free public parking zone, it's somewhat difficult to find a free spot near the apartment later in the evening.
All in all, we had a great stay and I'd gladly recommend Helena's apartment for a comfortable stay while exploring Prague.