This is a great Airbnb for one person or a couple. We were three friend. The location is absolutely unbeatable. Very close to Central station (about a 6 minute flat walk) and an easy walk on to the main parts of Brussels if you are familiar with the city. Check-in was extremely easy and the host communication was excellent and he was able to help us with a forgotten key quickly.
However, traveling with multiple people who won't be sharing a bed could be problematic. It's a bit smaller than you think and not set up great for more than two people. Upon arrival we found all of the previous guests' bedding in the shower, and the apartment had not been cleaned even though we arrived about 6 hours after the stated check-in time. The host explained there had been an issue with the cleaners and offered us a different stay a 10 minute walk away for the night. We declined as we needed to unpack and be ready. Upon further inspection, the shower fixture as broken and we had to come up with a creative way to fix it for the week-long stay.
The bed in the bedroom was broken in one corner and taped together. The pullout bed suffices, but after a long stay the noise and comfort level started to become noticeable.
Checkout was easy, and with a little TLC and more attention to detail between guests this apartment would be a 5-start apartment. We would stay here again if it's available.