This airbnb is a fine place if you just need a place to sleep for a night or two. We had the small room with two beds. We were there at the end of August when it wasn't that hot at night, but we were still very hot in the room. There's a small window in the bedroom that opens to the kitchen, and it's beside the kitchen window. I didn't feel very safe leaving the bedroom window open at night, but we left it a little open and didn't have problems. If other guests wanted to, they could easily get in and take things during the night. My friend who stayed with me (a woman) said she wouldn't feel safe here if she was alone.
Communication with Niko was clear, however it would take a few days to hear back from them. Other than that this is a fine and cheap bnb if you just need a place to sleep, not too far from the city center in Prague. There's a fridge (freezer was broken), stove and oven, a pot and pan. Someone comes and cleans every morning so it's very clean in the flat.