Hotel Delta? Acceptable. Location?
I have stayed @ the Delta; it's located 4 - 5 blocks from 27 Febrero, almost directly off Churchill. It's a pleasant, suburban location, near a large university, a clean, well maintained neighborhood. It reminds me of a typical USA Holiday Inn, with the premises slighly neglected & shopworn. It's clean; everything works; most of the guests are foreign business class people. Not much is w/i walking distance. Virtually none of the help speaks English if this is a problem. SUGGESTION: book at the Delta on the phone, preferably using somebody who speaks VG Spanish. The internet prices are @ 200 pesos more per night than the telephone prices?? Life in the DR! The Delta is 3 - 5 miles from the Malecon & the Zona Colonial; @ 10" & a US $3 - 4 cab ride.
I've also stayed @ the Wellington; small, pleasant, charming; located in the Gazcue section [consisting mostly of clinics, medical offices, middle & upper class apartments]; a nice, quiet area. It's 1 block from the Malecon & a 5" walk from the Zona Colonial. Many interesting restaurants, historical sites, & stores w/i easy walking distance. It's on Independencia street - a major traffic artery; trucks & buses can make it noisy @ times.
If this is your 1st visit to Santo Domingo, I'd select the Wellington; quaint, Spanish decor, distinctive, & cheaper. Much of the help @ the Wellington speak passable English. Both accept Visa & MasterCard; the Wellington adds a surcharge [5%, as I remember]. SUGGESTION: take a look @ the Casona Dorada, across the street from the Wellington; newly decorated & superior to the Wellington in some areas - in my opinoion. Good luck.