Contacting Filip was a very easy process. He e-mailed me detailed instructions on how to find his studio from the train station. Unfortunately, I was unable to meet him in person, but he was helpful and responded quickly via messaging. Instead, we met up with Samuel, who was friendly and showed us the way in.
The studio is located about 5 minutes from the train station; very convenient for those who just want to drop off their bags and explore the city. The square is located a bit further, perhaps a 15 minute walk. I didn't have an issue with security, as you need to pass 2 gates to get into the complex, and through another 2 locked doors to get to the studio.
The studio itself is kept tidy and clean. Also, Filip and Samuel had stocked the fridge with drinks. The kitchen is fully equipped with pots, pans, and a coffee maker. The location can be a bit sketchy at night time. I would not wander alone in the area after dark, but other than that, it was great. I would definitely stay here again if we decide to visit Brussels again!