I stayed here for a month during my time in Barcelona. It is very well situated being just walking distance from very vibrant streets and tourist areas. The apartment is well priced for a person living alone. The apartment is exactly as the images online. If you have big bags be aware of carrying these up the stairs. The washing machine is shared in the apartment building and you can make use of it at anytime. The wifi signal is perfect I had no issues.
The balcony does not face a busy street. It overlooks a closed off small road which helps keeping things relatively quiet, however the walls are quite thin.
The management was really helpful and always responded to messages immediately. Especially the initial hand over was very professional and welcoming.