Manuel's place is located perfectly for any and all sites that you'll want to see in Barcelona. It's steps from multiple metro lines and walkable to many spots as well.
The space is open, very clean and the AC unit is key:) Despite it being located on a very convenient main street, we found it perfectly quiet at bed time.
My only complaint/thing I didn't love was the bathroom. It's a bit of a strange multi -level small space. My bf and I are small/short so it was OK but the shower is tiny, even for one person. So if you are tall or want a spacious shower/bath area, this won't provide that.
There was bathgel and a bar of soap available but I'd still recommend bringing your own.
Overall, I'd definitely recommend this place, given its location and the space in general! :)