Location, location, location! This is a perfect spot to visit Barcelona and where you want to be: walking distance from subway, from Casa Mila' and Casa Battlo'. Charming older building that was very clean and had all the amenities needed for a brief stay.
Only major issue is noise at night due to location, that hopefully will be solved by changing windows. But customer service by Arago312 is way above average, so while we may not choose this apartment again (till noise issue is solved), we would definitely rent through these hosts should we return to Barcelona. Good hosts make a difference, so no need to look further.