We had booked with Martin for a couple nights before leaving for Vienna then coming back and staying for a couple more nights with Martin.
Positives: Overall Martin and his roommate are nice guys. And most of the tourist attractions and trains are 10-15 minute walk away. Wifi was also helpful.
Cons: However, there were some hiccups with our stays, especially the second leg that would prevent us from rebooking again.
First off, Martin didn't tell us he was leaving for Mexico and that his roommate would be waiting for us the night we were scheduled to come back from Vienna. He knew we would be back at 9:30pm based on our train arrival and said that he's be there and that the cleaners would have our room ready. He had only left his phone number for us. When we arrived at 9:30pm at his apartment after a long train ride we had no luck in phoning or texting him. We even went inside a restaurant at the bottom of the building requesting the waitress make a call for us in case we were dialing wrong. We ended up waiting outside his apartment building for an hour hoping he'd show up. Martin's name was not listed on any of the buzzer numbers. Finally, the restaurant owner and a neighbor who knew Martin came by and told us he had left town that day and pressed the right buzzer for us. Unfortunately the buzzer still had the previous owners name on it so we had no idea which one to press as there were approx 20 names, none of them being martin. When the roommate opened the door he showed no remorse or care that we had been waiting, he simply said he's been waiting for us and we were impeding on his bedtime. This left a very sour taste in our mouths.
Some other issues/things to consider before booking.
The bedroom is located right next to a church bell that rings loudly every 15 minutes, if you are a light sleeper, this place is not recommended. Also, a garbage can in the bathroom would have been nice instead of having to use the one in the kitchen, I recognize this is a guys pad so it's quite minimalist in details. As a girl I have floss and various cotton pads for make-up removal to dispose of. Lastly, Martin didn't provide any directions to get to his place which most other airbnb hosts do, only a rough google map. Directions would have been helpful as we got lost and also had to rely on friendly strangers for help. Overall, I can give this place a 3 star at the very most.