We are going to Berlin for a week in late March and are on the verge of finalizing hotel reservations -- probably either Art Nouveau, Hackescher Markt, Honigmond Garden, or art'otel. Does anyone have a strong opinion on these or others? We'd like to be in Mitte, or easily accessible to Mitte. (My partner can't deal with Propeller Island due to the lack of phones in the rooms, and Kunstlerheim Luise seems a bit spendy.) And does anyone know anything about the website HotelDiscounts, which seems to give huge deals (even when you add in the VAT and the "service fee"?