Mar and her son really did make me feel at home. She was very helpful and friendly, and everything in her home was easy to access. The bed was incredibly comfortable, one of those beds that you snuggle into before you decide to get up. The shower and sink had very hot water, and it was easy to manipulate (it was not hot-cold, you could easily find the right temperature). It really is easy access to the metro, and a grocery store is right nearby.
If you are not used to Spain's culture, just know that they eat dinner late (9pm -11pm), so expect some noise, but I didn't find it disruptive. Also, the shower was a bit small, it just fit me (I'm a bit oversized at 5'8 and 200lbs), so if you are a larger person then the shower might be a challenge.
I would absolutely stay at Mar's home again.