my mum and I really enjoyed our stay at The Mo House. it's perfectly located near the Arc de Triomf and walking distance (10-25 minutes) to La Rambla, Barceloneta, Gothic Quarter, and other key areas. it was nice to feel like you had a large space to yourself, paired with the perks of housekeeping.
my one piece of feedback is on clarity with communication with two points: (1) the room was not made up one day because we left after 2PM. when I raised this with the host, I was told that the housekeeping hours are from 10-2. however, signage in the room indicates hours are from 11-3. it was not a big deal in the grand scheme of things, but small things like this can be frustrating.
the (2) point is on the city tax. on the Airbnb listing page for the room, it indicates a fee of €1,54/person/day. for us on a five day stay, it should have totalled just over €15. however, the message I received from the host requested I leave €20 in the room (reflective of €2/person/day). again, this is a minor difference of give/take €5 and not super consequential, but felt like another instance of either changing guidance or poor communication.
if you go in to your booking with those two things clear upfront, you'll have a lovely time! I'd still recommend it to friends.