Could you please merge those two? It is one and the same location. Under the name "Boekenhuisje Plantinlaan 50" (because it’s more convenient with the address added).
Done. "Boekenhuis" seems a rather generic term to me, what with the multiplication of those mini street libraries and book huts, especially in Germany and the Netherlands. As both zones were created within a few days, I don't think the risk of merging 2 distinct zones was too big, though.