The apartment on Carrer de Corsega is exactly as described and pictured. We found the space sufficient for our family of 4 from the US, including a 14 year old 12 year old. The apartment included a hair dryer and washer, which were both welcomed. The beds and pillows were extremely comfortable and the air conditioning was a nice amenity.
We used the Metro and Cabify (like Uber) to get around. The Metro was a two blocks away and got us to all the important areas of town. La Sagrada Familia is a 10 minute walk away but we found you'd want transportation to all other areas, especially the Gothic Quarter/La Rambla, an area we fell in love with. There are a few good restaurants near the apartment but again, we liked enjoying the busier areas. We did enjoy a pizza in one night from Pizza Que! nearby and it was excellent. The beach is a 10 minute cab ride or you can take the Metro.
Frederic and his staff were excellent to work with and provided us with an iron and extra keys upon our request. The office is literally right around the corner from the apartment, which made check-in quite convenient. We did have to pay a 7 Euro tax upon arrival as Frederic stated it was a city tax that he couldn't charge via Airbnb.
If you are looking for a clean, spacious apartment slightly outside of the city center with easy convenience then you will love this apartment!