Marta is a wonderful host- she responds within a few minutes of your message. She is very helpful, and always asks if she can do anything further for the guest. Her apartment is very modern, tastefully arranged, and has all of the conveniences you are looking for: a great bed with an amazing mattress. The kitchenette is fully stocked with all of the appliances. There is no dryer in the washing machine, but you can dry your laundry on the balcony, which is secluded. There is no noise from the neighbors, and you can use elevators to get to the floor.
Highly recommend staying in her apartment in Triana- there are plenty of bars and restaurants in the area. The metro station is a block away as well.