Mercedes was such a gracious host! My luggage was lost and she helped me by letting me use her phone, accepting it when it finally arrived and even offering me extra nights if I needed. She welcomed me with a small celebration and was generous the entire time. I was only there 2 nights but I would recommend Mercedes' home based on her hospitality alone.
Other perks: great location, right near la ramblas and the gothic district. This room has a private Terrace which was nice but because it was January it was a bit chilly. The larger terrace at the front of the house allows you to watch the sun set and it's very warm in cooler weather. Every morning Mercedes would wake up before everyone else to set up a nice breakfast of meat, cheese, juice, coffee and breads. Very good way to start the day!
Some drawbacks: Internet was a bit spotty, and almost non existent in this room. May have been better in the other rooms. Also there are a lot more stairs than I anticipated. Be warned, it's a lot (but such heights afford a Great view!) The shower was what most people have told me to be European. The shower head isn't fixed you must hold it while you shower. It wasn't something I'm used to and for my short stay really wasn't that big of a concern.
I would definitely suggest Mercedes home!
(Ps. She has a dog which I don't remember reading about but he is very very friendly Quiet and you won't even know he's there!)