Noisy neighbours, we could hear them late at night. The entrance door was slamming and waking us up all night long.
The carpeted floor was not clean (hair, dust) and the bathroom sink contained clumps of hair from previous guests.
Only one key for a 4 persons bedroom, which was very constraining.
On the last day, we had to wait until 11 to let our luggage to the reception, which minimized our time in the city for our last day in Prague before taking the plane.
The location was really good : direct access to Old City and tram to explore further.