I absolutely enjoyed my stay. 100% I was in Barcelona to search for my own apartment to buy but was also working during my trip so I was visiting properties in the morning and working in the afternoon until fairly late in the evening as I was aligned to New York's work schedule. I arrived early from the US but was able to drop my bags off and return later once it had been cleaned. Communication both before and during was great. It's clear they really want to ensure great guests, so you'll likely be subject to some questioning about age and purpose of trip. That didn't really bother me, but be prepared.
The place is exactly like the pictures. It'll easily accommodate 4-5 people sleeping-wise, but with just one bathroom, you'll be fighting for space. Otherwise, it absolutely delivers on its promises. There's no decent workspace but the couch was just fine and I was able to have Netflix on while I worked, which was a bonus.
The location is ridiculously central to everything touristy you'd need. Ramblas was a stone's thrown away. Barcelona is very walkable/metroable anyway, but the location is perfect for everything you'd need.
I would absolutely stay here again and would recommend it to others.