We had an amazing four-night stay at Marta & Cesc's place and they were terrific hosts. The apartment is in a great location and is exactly as pictured and described --- steps away from the Sagrada Familia, a couple of blocks walk away from the subway and close to a wide range of great restaurants, cafes and supermarkets. It was lively during the day and quiet a night -- no problems with sleep. It is on the third floor and there is no elevator in the building -- so there were a few stairs to get to the flat, for those who have mobility issues, but it wasn't a problem for us. Marta & Cesc also helped us carry our bags up when we arrived and down when we checked out.
The apartment itself is equipped with all the amenities you would need for a comfortable stay, including free coffee and tea, basic toiletries and some cooking essentials like olive oil, vinegar and spices. Great for families as they were able to provide a crib and children's plates/cutlery, etc. Marta & Cesc themselves are great hosts -- they met us upon arrival and walked us through everything we would need to know for our stay, including info on the nearest supermarket, tips and suggestions on the best metropass to buy, metro routes to take to key destinations, restaurants and cafes and more. Would definitely stay again and recommend to anyone traveling to Barcelona!