We stayed 15th-18th December and had a great time. Brussels is a lovely place to visit, very chilled even this close to Christmas and we had a great time exploring (and visited Bruges for the day which was amazing).
The apartment is about a 10/15 minute walk away from the city centre in a nice area and is on the first floor. It's about a 5 minute walk form Brussels Centrale as well which is great. The apartment is unusual, the main bedroom is stunning and the living area is nice but the bathroom/kitchen and second bedroom all look like they belong in a different property!
Samy was great to deal with and was extremely helpful. If you're looking for somewehre to stay in Brussels then Samy's place is highly recommended.