Positive:
It is possible to get the letter to get the registration in the city hall, which is not common for Airbnb accommodations. If you have a job visa and need the registration, it would be a thing to consider;
The entrance for the guests is separate from the main entrance;
There is a private bathroom for the guests;
The mattress is comfortable;
The apartment is well-located: near to the train station, bus lines, markets, restaurants...
Negative
The description says that it is not allowed to smoke on the property, however, one of the owners smoked in the kitchen and sometimes we could feel the smell in the bedroom;
We had to deal with the owner the hours that we would use the kitchen and we had to clean it in the exact way that was demanded;
The heating was turned off in some periods of the day, we were at the house during the winter, and it had not been communicated on our first day. We only found out when we got in the home at night and it was pretty cold;