Christian's room was absolutely perfect for what my Mom and I needed. It was centrally located, next to grocery stores, bakeries, and La Rambla, but still SO quiet. With AC, a washer, and a fully stocked kitchen, this is the best bang for your buck in Barcelona. I met a few other travelers during my stay at Christian's as well, so this felt like a mini hostel with two private rooms side by side. Christian was SO helpful with recommendations - I did the majority of recs he sent me and it was perfect! The rooftop was an added bonus as well, I spent a few nights up there after a long day out and about. Lastly, the WiFi worked perfectly the whole time I was there.
The only thing worth noting, if you're a solo female traveler, is there are no locks on the door to your room. However, there are 3 locks to get inside the unit, so it's still SUPER safe and I felt totally comfortable the whole time.
I would definitely stay here again if I was ever back in Barcelona and recommend it to others for sure!