Had quick responses from Nacho regarding the booking initially and he was available should we need him throughout our stay. Jacobo was waiting at the apartment for us on our arrival and he ordered a taxi to take us back to the station on our departure.

Apartment was in a great location, a good street to be in for access to bars and restaurants, where we found some great ones within 5-10 minutes walk.
A quiet street apart from the early hours of Sunday morning, which was a one off.
For supplies, there's a supermarket about 10 minutes away on the main street, Guillem de Castro, or smaller convenience stores less than 5 minutes down the same street.

The apartment itself was a good size, with 2 double bedrooms and 1 single. The main double had an en-suite. The beds were actually 2 singles which did move through the night, so be aware. Both bathrooms were great, the en-suite had a good shower and natural light (but windows were not frosted) and the 2nd bathroom was also good but with a smaller shower.
There were plenty of towels and the hosts provided shampoo and shower gel should you need them.
The kitchen was equipped with a coffee machine, coffee capsules and sugar, we just had to buy the milk.
There was also a washing machine but no washing powder/liquid that we could find (almost used bleach by accident!). As there's a supermarket so close you should easily be able to purchase it.

Overall, we had a great stay in Valencia and would definitely use this apartment again.

Thank you Nacho and Jacobo.