good luck with all that, job is normally obtainable only be reference.
for accommodation try puerto plata beach resort on the malecon. as i recall you wanted safe and furnished, there is 24h security, all apartments are furnished. it is partially hotel, partially condominium, there is a pool and tennis courts.
Puerto Plata Beach Resort
Av Circunv Norte
Puerto Plata
(809) 586-4243
i have heard they are renting accommodation, long term.
nothing fancy but not bad.