It's in a great location relative to many of the tourist hotspots and metro/bus stops. Unfortunately, we didn't realise until we got there, there was only air-conditioning in the living/dining room. There's no air-conditioning in the bedrooms, and in the start of August, it was unbearably hot in the flat anywhere but the one air-conditioned room. We tried opening windows and doors elsewere to create a through draft, but it jut resulted in doors banging shut.
The flat is spread across two floors. The kitchen is downstairs next to a single room leading to a balcony. Up the stairs is the toilet/wet room (lovely shower head!) a double room leading to a balcony, and the living room/dining area, also leading to a balcony. You are always carrying food and crockery upstairs because of the layout, which is something to bear in mind. The living room has a double sized sofa bed - very comfy and has the benefit of air conditioning! My mum and I just slept together on that, as there was no chance we could sleep in one of the other hot, stuffy rooms.
There's a microwave and hob, but no oven (not that you want to cook much in the heat of Barcelona!), with plenty of pans.
We really enjoyed how quiet it was at night, which was ideal, especially considering that we saw next door had kids! Elizabet was fantastic at staying in touch, which was very helpful and appreciated. Lots of towels (including designated beach towels) were provided, too!