Pretty nice place! Spacious interior, separate areas for dining, bedroom, and work area.
Only thing that caught me off guard: when you exit the unit and go down the hallway, you need a key to get OUT from the hallway into the main building and exit. I've seen this in a couple buildings in Prague, that you need a key to get out. Here in the US, that would be uncommon, and likely considered unsafe, from a fire safety perspective. This is definitely not Lenka's (the host's) fault, it's just the way the building was constructed, but for the sake of fire safety I would rather see that lock changed!
Other than this, really nice place once you're inside.
Right next door there's a Medieval Alchemy workshop (check on Google Maps), really cool place worth visiting! And overall, this location in the Old Town is so very nice, so much to see there from Prague's history.