The place is absolutely lovely! It looks like a typical spanish home from the outside but very modern, spacious and well thought of on the inside. It has all the amenities and is definitely worth the price.
Theo definitely deserves the super host tag. He provides a list and map marking the main places to visit around the area to kick start your holiday. Best of the list is a tiny restaurant called Las Parras around the corner - amazing home cooked 3 course meals with great quantity under 9 euros! There's also these yummy chocolate biscuits Theo keeps as a welcome gift, which you should definitely take back home (available at supermarkets). He was kind enough to surprise me with more to take back home :)
It's also a good location to be in, there are many restaurants, pubs and cafes around and the metro and bus stops are 2 minutes away which can get you to the beaches, commercial streets, the Barcelona stadium etc.
I will come back to Theo's if I do visit Barcelona again.