The Generator Hostel is a real treasure of backpackers in the city of Madrid! It's located in the city center about 5 minutes far from the metro station San Domingo and about 10 minutes from Plaza Mayor by walk. The facility itself provides a range of services like bike rent, gaming area, rooftop bars and hot tubs with a view of Madrid. Moreover the rooms are super cool! The receptionist was so nice he placed me and my two friends in the same room with its own bathroom and toilet. I can only highly recommend this accommodation!