The place is terrific! 5-10 minutes to Old Town Square and whole Prague 1 district. You can start enjoying Prague right after stepping out of the door :)
Apartment has every amenity one requires and then some.
One room is bedroom, another is kitchen with sofa. Kitchen is large enough, may be 15m2 or more, so that doesn't feel uncomfortable.
Ondrej and Veronica were an excellent hosts and made every effort to accommodate us - we have a very late check in (way past midnight), so they found a place to leave us a keys, and then when I couldn't open a door to the apartment, guided me by phone (again, way past midnight).