At our arrival, Pilar explained everything very well and helped us get settled. We had no worries at all. The flat is incredibly convenient (All appliances you might need).
The location is great, really can not ask for more. Other locations might be prettier but either too noisy (Ramblas) or inconvenient. Her terrace offers a great place to relax in the evening after a day of walking around.
Even with our toddler walking up and down stairs was not a big deal. There is a convenient subway stop 1 block away, many restaurants and at least 3 supermarkets.