Sebastian is a very nice and friendly guy, who did his utmost best to make us feel welcome. We had a good time there, it's a great base to discover the city from. The room is small but fine, with a nice view on the church across the street.
People have warned us for the neighborhood but we felt excellent there actually. We didn't go on the streets after 12 in the night, but the metro station is nearby and we felt totally comfortable and safe.