Great experience! This was my first time using airbnb and it was awesome! When I arrived I was greeted in the store by a lovely lady who helped me with keys and getting in the building/unit.
Once there the apartment was exactly as described. The only thing that did take some getting used to was going down the hall to use the restroom but it wasn't a big deal at all. The shower was great; I always had hot water. The apartment is small, I wouldn't recommend more than 2 people but the high ceilings give the place a more open feel - you don't feel claustrophobic.
The location is amazing. I was 8-10 minutes from everything; closest to Old Town Square which was perfect. I was able to walk pretty much everywhere but when I did need the metro it was easy to find as well.
As a guest you do need to realize it can be loud. There's nothing Martina can do about the noise. There is a bar right across from the apartment and its Prague - there are always going to be in the streets. I didn't find it to be too much of a problem - especially with headphones.
If the opportunity presents itself to return to Prague Matina's location would be my first choice (pending Martina allowed me to stay again). Highly recommend staying here if you visit Prague.