Mariano was a great host. Even though he wasn't able to check us in himself, he made it possible to let us in by a friend. The day after he checked with us how everything was going and answered open questions. He provided us with directions in the beginning which was really helpful.
The apartment it self seemed recently renovated and was just amazing. The bed was very big and comfortable. Kitchen basics were provided, even a dishwasher is installed.
The apartment is located in a, what it seems like it is a working class neighborhood, however you see lots of families and we didn't feel unsafe at all, even coming back at night.
Grocery stores and public transit (bus&metro) are a five minute walk away, we got to every place in the city really quick.
To summarize, it was a great apartment and an awesome stay, there was no down point.
We would definitely recommend this apartment and will book again for future stays in Brussels.