There should a disclaimer in the post about this apartment regarding the access route and the amount of stairs to get to the apartment. The '4 floors' mentioned in the advertisement are much more, as well as steep and verging on dangerous especially with luggage. No one with underlying health issues should consider this apartment either as the stairs will leave you completely breathless.
Aside from entrance issues, the host was very helpful with regards to collecting the keys. The apartment is chic with a vintage feel and good amount of natural light.