I was lucky enough to stay at Mirjam's apartment for a month, I had a month long project in Barcelona and the home was super close to where I worked.
Mirjam's space is absolutely wonderful. A truly thoughtful designed layout to the space, has a nice flow and lovely kitchen. All spaces are open onto each other and are great social bonding as well.
Poble Nou is a nice neighborhood if you don't want to stay in the middle of downtown, crowded with commercial stores like McDonalds/Starbucks/and other cheesy stores. Instead, you'll find a nice mellow neighborhood with people yet not over crowded and not loud or noisy. Not that much traffic so youre able to go on nice walks, and you're likely to find and see many artist studios in the hood. Cute cafe's and small breakfast spots that are not commercial but local gems. (Try cafe industrial, espai julio, and All you Eat is Green).
It's a home you can really be comfortable, watch tv, cook a nice dinner, enjoy dinner on the terrace, has an okay amount of storage for your belongings, and is overall very clean. There's also everything you need like laundry things, dishwasher, and stuff to keep your stay easily maintained. They even sent me a cleaning team for the middle of my stay for free!
Finally, all correspondences were so easy and pleasant. I hope to come back to Barcelona and stay here again.