The apartment is in a very convenient location. There are 2 metro stations within a 5 minute walk. The place is comfortable, beds too. The larger bedroom has no closet, so you need to use the one in the hall. The second bedroom is tiny - it has a twin bed and that's pretty much all that fits. But, it has a good size closet. The bathroom is good. There's a washing machine, but no dryer. If you go when it's warm, you can hang your laundry outside on the balcony.
The owners overlook some things, which in the grand scheme of things aren't a big deal, but would make the overall experience better. There was no dishwashing liquid, a sponge, only one roll of toilet paper, no basics like salt, pepper, sugar, kitchen towel, laundry detergent, etc. There's a small market across the street, so you can stock up there.
Also, they only provided one set of towels (one bath, one hand) for each person. This was a bit inconvenient. We stayed for a week, so needed to wash and dry, which is tough when you leave the apartment in the morning and don't come back until late; they don't quite dry overnight.
One other note, I don't think the apartment is actually in Eixample, though again, the location was convenient.
If not for the above small stuff, would be a 5.