are several "Guest Houses" that rent Rooms.....albeit not up to "resort" standards but clean and comfortable and relatively inexpensive.
These include Hotel Flor di Loto (email
hfdiloto@codetel.net.do), Don Pedro's,
Damar Guesthouse, Plaza Real (has contact info in the DR1 directory) as well as a couple of places that offer "flats" for which one must be in Juan Dolio to inquire about availability. For example there are one room mini-apartments with bedsitting room,kitchenette and in room bath in the Marie Michel building (see the Dutch fellow at the satellite place at Oasis for info), also above the Minimarket Naito, and above the German cafe beside Marena Beach resort.
Sorry I can't give you specific contact info for all these but you shouldn't have any trouble finding a reasonable accomodation outside an AI in Juan Dolio.
Hope this helps!