Overall a bad experience, despite the price and the apparent standing of the flat.
I stayed one month and chose this flat for its location, high ceilings and the promise that it was 'exclusive' as shown in the ad title. As I was to work from there, I was willing to pay the price (close to 2000€) to be worry-free, comfortable and enjoy Barcelona in my free time.
At first, I was very pleased with the flat and the team was friendly and communicated well (nice when things are going well, but it didn't last long when problems arose - when it matters).
The biggest issue was that once I made a complaint about the problems that arose, the host's tone quickly changed from nice to disdainful; problems were minimised, they told me they didn't understand how I could go from satisfied to complaining (as if problems cannot arise) and completely ignored me on my small refund request that I formulated in a very nice and consilient way. I sent a message to explain why I thought these issues were preventable and why I am requesting a 20% refund (excluding the booking and cleaning fee). I got ignored.

I am only listing the problems that could have been prevented and that are lies on the listing:
- First big disclaimer: the 'double bed' are actually two single beds attached together with tape (I have shared photos with Airbnb). At first, it was ok and I didn't think much of it, and the flat was nice overall so I didn't make a fuss. Then, it became impossible to sleep as the tape and 'home-made' attachment of two single beds was falling apart: there were separating at night, and the mattress topper was making it worse by creating a huge gap in between. Only the frames of the beds were attached, but not the mattresses, so it was impossible not to fall in the gap in between the beds. Needless to say, my sleep was highly impacted and I had back pain most of the stay. In the end, I decided to go sleep on the single bed on the kids room of the flat (I told the host - no sympathy, no apology).
- Another problem that could have been avoided if they were proactive: Since I arrived, they made me aware that the washing machine was faulty and getting stuck- after a week, my clothes were getting locked in the machine as it didn't open - up to 48h once! Then, the machine completely broke at the end of week 2 and I was left without clean clothe and sheets for a week (two weeks, if we count the technician coming for quick fixes that were resolved for less than one day).
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- The bad faith with which the problems were dealt with is unacceptable: telling me they never had issues before, questioning how I can one day be pleased and think about extending my stay, then point out issues and ask for a refund...
- I am not saying I was left to myself and that all was bad: I had other small issues that couldn't be foreseen and for which the host was quite helpful: the fuse went off leaving me without electricity and they helped me on the phone to fix it; the toilet flush was stuck and they quickly offered to get a technician. BUT for 2000 euros you expect a bed and clean sheets and clothe and to at least have a sorry host willing to make it up to you!
- Last but not least: I broke a lamp while removing the mattress topper from the bed in order to avoid falling in the middle, and they requested for me to pay for it!! How audacious and cheap of them considering as I had to pay for my laundry for two weeks and paid for new bulbs (as agreed with them) - and I didn't even ask to be reimbursed!
I think this flat is not up to par and the host should know that being nice and flexible is most relevant to their job when problems arrive.
This is an honest review and I host no personal vendetta. I tried to discuss it first with them offline but I was completely disappointed by how they chose to ignore me and minimise it all.