Alin's place is exactly as described in the listing. The bedroom is much better quality in the terms of space, decoration and comfort than similarly priced listings. The area is quiet and approximately a 20 min walk from the city centre and other main tourist areas. The access instructions were very clear to follow though you do indeed need the airbnb app on the phone to get them.
Others have mentioned Alin's "rules". To be honest these are essentially common sense for how to use the shared areas with other guests. Things like no (very) late night use of the kitchen etc. It would be very difficult to unknowingly break these rules. Just be courteous to other guests and you will be fine.