Rented the Joan Blanques place for 5 night with 3 people.
Pros: location was quite centrally located to the major attractions such as Sagrada Familia and La Ramba which were a few metro station stops away. Metro station is approximately a 5 minute walk away. Have plenty of restaurants and supermarkets nearby. Apartment looks exactly like in pictures. Check in and check out process was smooth - didn't meet host but a colleague (had to pay Euro 11.25 upon arrival). Wifi worked great in both bedrooms (modem located in main bedroom) but lacked signal as you walked towards a kitchen and will cut on and off.
Cons: second bedroom lacked ventilation and was stuffy. Place has no fan or air condition so very hot in summer. Bathroom lacked mirror. Some of amenities not adequate enough - has to replenish the toilet rolls, shampoo and washing liquid. Washing machine was faulty - load was spoilt (contacted host to look into this and got a hostile response. Had to use the Air B&B resolution centre to solve issue).
Overall, location was great but would not stay in this apartment again. Better value for money for elsewhere (other Air B&B apartments).