Jan's flat was great and perfectly located. There is everything we could need for a few days' stay. The building is clean and secured, and Jan is very nice and welcoming.
The only negative point would be about the furnitures : the flat lacks few bulbs that could be replaced easily ; the floor tiles in the bathroom are moving under our feet ; and the most important thing was the matress, made with two single ones instead of one double, that were quite old probably, because not very comfortable (not firm at all, making us sink a lot...). For the value, these things were a bit a shame, and could be changed without too much trouble.
Though, we recommend this place and its host !