I had a trip planned with my girlfriend to Barcelona and we found Barbara's place as one of the cheapest and more central places in the city. The place is at 3min walking distance of one subway station but still you can reach Plaza de Cataluña, la Sagrada Familia, the Arco del Triunfo or the Parque de la Ciutadella in 20min just by walking. The neighborhood is nice, with a lot of residencial buildings in that square. You will find some small stores close-by that are open until late (even on New Year's Eve!) with limited but still useful inventory. There are some cafes close-by where you can get breakfast.
The building has an elevator so you can access it if you cannot use stairs. The room is big and you have plenty of space to put your clothes. It also has a table to work with the computer if you want. It is close to the main door of the apartment meaning that it is possible to arrive at home late without disturbing a lot to Barbara. The kitchen is fully equipped and you can use it! The bathroom is clean and big.
I would recommend this place to anyone traveling to Barcelona with the idea to know the city. It is central and even though it is expensive compared to the housing that we rented in other spanish cities, it is still one of the cheapest options that we could find in Barcelona.