I only need to say one thing - book to stay here!
The apartment is wonderful, certainly one of my top air bnb choices. Easy to locate, 5mins from Sagrada Família (and therefore metro line). 10mins to Glòries transport hub with access to both metro and tram. There are various bars and restaurants in the local area, and a supermarket 3mins around the corner.

Luis is the perfect host. He met us at the apartment (4th floor but there is a lift) gave us a brief tour and then walked us round to the supermarket so we could buy food before it closed. He was always available via WhatsApp if we had any questions.
The space is ample for two couples, Luis ensures there are two sets of keys for the apartment. The balcony overlooks the main road - don't be put off though because there is double glazing which dramatically reduces the traffic noise.
Bathroom - very clean, good shower, plenty of toilet paper, small 'gift set' of toiletries including suncream. There is also a range of shampoos and deodorants under the wash basin.
Kitchen - well kitted out. Kettle, microwave, toaster, fridge, freezer. All the things you would require in order to cook - pans, sieve, cheese grater, sharp knives, range of cutlery.
There is also a range of tea and coffee, spices, olive oil etc. The fridge was even stocked with beer and water :)
All in all, this is a very comfortable apartment and I would certainly recommend it as an excellent place to stay whilst visiting Barcelona. Luis and Gemma are wonderful hosts - thank you so much!