This place has a few things going for itself on the surface, but left us very disappointed.
Upon arrival, the front door was closed and locked and nobody was answering the doorbell. We were literally left standing in the rain, despite the fact that we were well within the listed checkin window (2PM-8PM). The phone number listed on the booking was not picked up, but we managed to Google a different number for the hotel. A lady picked up who showed up 10 minutes later.
She told us that we had not responded to an email requesting our precise checkin time (she was right, we did miss that email - it was sent literally a month earlier, well before we could have estimtated our arrival time). She also said we had not provided a phone number (which we actually did). An email or call the day before arrival would have been reasonable to expect.
It turns out there is no manned reception at all at this property. Day or night.
The appartment we booked was a bit worn and rough around the edges (repaired holes in the wall not painted over, loose wallpaper, etc). The sofa bed was not really big enough for 2 people (despite being advertized as such).
Worse still, the place was downright filthy. From a horrible stain in the bedspread to an uncleaned floor and widespread black mould in the bathroom.
The building has a nice facade and the ancient elevator is charming (if a bit scary to use). Karlovy Vary is magnificent and we will return - but never again to this place!