My colleague stayed at Serenia and apparently it turned out to be a small, not-so-comfortable dorm room. The place is very noisy the whole day and as the insulation is not good, you can hear everything constantly. Also in the ad, they say that there's a washing machine, but in reality the washing machine is busy from early morning to late night, and the hosts don't let you borrow washing powder. Could be OK if you are a young traveler and would like to sleep one night in Brussels, but definitely not a good place if you are a professional and planning to stay more than one night. The heavy greasy, spicy food smell in the apartment is another thing that's not so nice. She only met Serenia upon arrival, and didn't cross her during her 4-day stay in the apartment. So she didn't have much impression on her as a host.