Begoña is the best Airbnb host I've had. Some fruit and water bottle as I entered- top recommendations in Valencia, and even in Barcelona where I was headed next. Stay here.
If you'd like to see both beautiful downtown Valencia and a bit of the beach, this location is perfect. The place is tidy; space reserved in the kitchen; and the bed actually comfortable. Must be ok with walking up 3 flights of stairs.
Downtown is ~15min walk.. or less with the tram.
For the beach, the tram stop is on the corner and takes you right there. Enjoy!