St. Martenslane is part of the Townhouse hotel, so you check in across the street - there they also have a nice lounge area with books and games, and help-yourself, pay-yourself bar. The room I had in St. Martenslane was large, almost like a small apartment, with a light industrial theme, and a kitchen nook with microwave and some cutlery - very convenient when staying for a few days. You have to pay for any toiletries in the vending machine downstairs, which gives it more of a budget feel than would otherwise be the case given the spacious building and rooms. Overall, nice experience.