We stayed for 3 nights in Jams apartment and it was a great place to stay! Huge comfy bed! Nice big room. The location worked really well! Very quiet street, nice walk into the centre but also just a few minutes walk to the nearest metro which will get you right into the thick of it in just 5 minutes or so.
Took bus number 12 back from apartment to airport costing €7 and taking just over half hour.
Definitely recommend this place for a few days stay in Brussels