Mak's apartment is super well located for both a beach and a culture stay in Valencia. The beach is literally a 3 minute walk away, and the city center is nearby by both public transport and bicycle. I recommend getting a bike, and getting to the city center via a nice ride through the Jardín del Turia, super enjoyable every day.
The apartment and room itself are comfortable and have everything you need. Full kitchen, clean and complete bathroom; and Mak even let me use his iron when I needed it :P
As a host he will help you with everything you need - from late check-in, to tourist info for your visit to any items or advice. Great host!