This flat is lovely and perfectly comfortable for a week's stay. It feels very authentic and the location is away from the very touristy areas.
The location is amazing being a short walk from the Plaza Espana and the Aerobus and tourist buses. It is also above Poble Sec metro which is great for access but be warned, passing trains can be head for all but a few hours in the early morning. We got used to it quickly though.
Supermarket also just downstairs which was very convenient but the kitchen is very poorly equipped and not suitable for much more than the most basic meals, amongst other things there was no frying pan at all and no knife for chopping making cooking a real pain.
The only thing that properly marred our experience was the constant banging from next door. Must have been renovating, sounded like hammers and heavy drilling.
Appreciate this is not the fault of the flat or the company that rents it but maybe worth checking with them that this work has been completed if your trip is soon, as it was unbearable and a solid 10 hours a day.