Location:
Literally walking distance from Charles Bridge and the Prague Castle. Not more than 100 meters around the apartment are embassies - US, German, Italian, Serbian (I don't know if there's more) a police station is also just within 20m. The street leading to the apartment is guarded by a police check point. I felt very safe there.
There are also a lot of bars and restaurants in the area. McDonald's, Subway, and an Asian fast food restaurant are also in the near.
Room:
There is a general (maybe musty?) smell in the room. 1 blanket smelled like it did not dry properly...? In the room was very cold because the windows don't close properly and there is no seal around it. The radiator/heater also was not working.
There was no unpleasant smell in the hallways, kitchen and bathroom
Communication:
I got clear instructions on how to self check-in