The place is just as described. İt is super comfortable to stay and very accessible to discover the most amazing sites in the city. Metro, bus, guided tour buses are within short walking distance. Of course, taxis are available and reasonsbly priced. Try mytaxi app for Uber like experience.
There are many wonderful bakeries nearby for daily breakfast goodies :) There is even a gluten free bakery in the building. There are countless convenience stores all around.
Sant Antoni is a trendy location for dining and tapas, especially the Parlement and Blay streets, both of which are within short walking distance.
İt's also possible to walk to other trendy neighborhoods of Gotic and El Born if you're somewhat fit. İt's a very safe place to walk anywhere.
I'll certainly stay at Marta's home if I ever come back to Barcelona.