I have lived for one month in this studio flat too (I had also stayed in one of the other places Maria Teresa rents), and once again, all I can say is Maria Teresa is a fantastic host.
Communication with her was just excellent: great attention to details, superlative clarity, prompt response, and amazing kindness.
I felt like home during my whole stay: when I needed anything (additional household stuff, instructions to get my laundry done, or any other tips to make my stay as much comfortable as possible), Maria Teresa has always been impeccable and extremely professional in helping me out with any request.
She's probably among the kindest, honest and friendly hosts you can have the chance to meet in AirBnb.
Everything was perfect, the place was just amazing and totally corresponding to what you see on AirBnb.
If you hit Barcelona, then you must definitely not miss Maria Teresa's apartments.