Base on my last experience, anywhere around KK was quite near to the market. But the absolute closes hotel to the Filipino Market will be Le Meridien Hotel, which is just across the road. For mid range hotel, the Klagan was quite popular for local travelers too. Access to the airport is more or less the same throughout the city;but be careful not to get caught in a rush hour jam.

Non of it.

Yes.. It opens almost all year round except on Hari Raya Puasa / Aidilfiri where there will be much less traders/sellers around.

I do not think it ever closes, it is open from midday until approx 9 pm.

Depends on the sellers actually. Some open as early as 8.30am and close around 7pm. I had went there at 6pm and most of them close by 6.30pm-7pm. The later you go, the bigger chances they offer you good price. Good luck!