While we never got to meet Zsofi, she had Marketa greet us at the train and take us to the apartment--and provide wonderful (and thorough) information about the place. MANY locks, so a very secure building and apartment.
Older building (it's Europe!), but spacious apartment, everything works well, bed is very comfortable. Mostly quiet street, though with lots of foot traffic from the train station (two blocks away). Jubilee Synagogue is right next door!
Easy walk to everywhere we wanted to go, though tram was a block away, and metro perhaps four blocks. Nearby street had everything necessary, including restaurants and markets. A great place to eat was Paneria (we think that's the name), though their card says 'bistro Maurizio,' just two blocks from the apartment on Jindrisska street.
In Prague, be sure to do a river trip (one hour is fine). See a music concert. Visit Zizkov Tower (charming, with crawling babies, though some think it one of the ugliest structures anywhere). There's a huge open market downtown with countless wonderful shops.
Hop-on-Hop-Off has a castle tour, we had Nikolas, a young student who gave us great information about the history of the city/country/region.
Just scratching the surface. Prague is amazing, should be on everyone's "gotta visit" list.