This unit was very centrally located. You could not ask for a better location for the city and it was extremely safe. The bus from the airport drops you off 1 block away from the unit and there are tons of restaurants, shopping, and markets within 1-2 blocks.
Despite the busy location, it was not noisy at night and the hosts provided ear plugs if you needed it. The amenities were standard and the unit was very bright during the day. We visited during November so we didn't use the AC units (there are 3).
The host/management company was very responsive. There were a few very minor issues that they tended to but it didn't affect our plans.
We would stay there again if we were to visit Barcelona in the future.