The main advantage of Lismar's place is that is right near the El Carmen metro station (line 5). However, please be mindful that the flat is on a busy street, like others pointed out, and it's going to be very noisy. I managed to get by by closing the door of the balcony at night, even though it was hot, but a fan was available in the room.
During my stay, there were quite a few people in the flat, so I had to wait a few times my turn at the bathroom. Also, because the bathroom is shared and quite small, almost no toiletry was left in there.
The fridge was almost full but I managed to put some bottles of water to keep them cool during the night.
At the beginning of my stay, I received one roll of toilet paper and a big bottle of shower gel. Lismar was very helpful when I've requested a bar of soap as well to wash my hands and another roll of paper to be left in the bathroom. She really respondents within an hour, even during the night, and ask about your well-being, if you're not home yet.