We were met at the apartment on check in and Jenifer was very helpful showing us how to get around and giving local information. They were quick to respond to questions even though it was late at night and willing to go above and beyond to ensure our stay was enjoyable.
The apartment is spacious with excellent air conditioning which we really appreciated in the heat.
It is walking distance to all of the major tourist attractions so we rarely used any public transport.
If you google 'free things to do in Barcelona' there is a whole list of things that are free on particular days/times which saved us a lot of money. Also if you use any public transport you can buy a T10 ticket which gives you 10 journeys on metro/buses for 10.20 euros and you can even pass it to a second passenger, this again worked out at half the price of buying individual tickets.
We had a great stay and would recommend this place to anyone visiting Barcelona.