The place is clean, she gives you all the necessary things required for a great stay, the AC was powerful enough for a hot summer day and we saw there were heaters for the winter too (we didn't need it). The bed was comfortable.
Isabel's place is at a great location, you can quickly reach the main attractions by public transit or taxi quickly. If you are coming by air it's only a bus stop away and the train station is only two metro stops away.
Check-in and check-out was easy.
If I am ever in Barcelona or my friends and family are visiting I will 10/10 would recommend this place.