I would just peruse Booking . com, and for each hotel you like check Google Maps for how long the metro ride is to the venue.
Keep in mind that many Prague hotels don't have airco and June can be hot (it was fine this weekend).
Advanced mode: get a hotel in the center for the first few nights, then switch to Duo.
Decided to switch it up…not gonna slum it per my usual routine. Combining this with an anniversary trip with the Mrs. Gonna stay in Prague 1 (with AC) and it looks like I can just walk to metro c.
Gonna be an amazing week!