The Pros: Good size 4 bedroom apartment worked well because we had children in our group. Kitchen handy for meals, especially breakfast, which we ate in daily. 2 bathrooms, although one was very small. Beds were reasonably comfortable; we slept well. Good location on Carrer de Valencia at Passeig de Sant Joan and Avinguda Diagonal; 10 minute walk to La Pedrera (Passeig de Gracia), 20 minute walk to Placa de Catalunya and the Ramblas, 15 minute walk to Sagrada Familia, Metro stops Verdaguer and Girona 5 to 10 minutes walk. Large neighborhood market 2 blocks away on Valencia toward Passeig de Gracia; wonderful fresh fruit, eggs, cheese, meat, you name it. On the Carrer Arago side (the building is a block in length) is a store where you can buy any other necessities; wine, toilet paper, paper towels, bottled water, yogurt, cereal, milk...
The cons: The building and apartment condition are average and show the normal wear and tear you would expect of an apartment being used continuously by many people.
If your expectations are for an average apartment in average condition, you won't be disappointed. If you want an apartment that is pristine and/or luxurious you may want to look elsewhere and probably pay more.