Loisaida Barcelona. Award winning vintage retro store in Barcelona. Loisaida is a vintage retro store offering clothing, accessories, gifts and home items. Loisaida is located in what is thought to be the former stables of the Royal Mint which was called "La Seca". The name Loisaida is inspired by the lower east side New York "spanglish" district of the same name. Fascinating and fun shop.