We recently spent a long weekend in Rehoboth and stayed at Silver Lake Guest House. We've stayed there before and are glad to report it's still a great place to stay.
The room was immaculate and very comfortable with a beautiful view of the lake and a small bit of the ocean. Rates seem inline with similar accommodations in Rehoboth.
The owners were very welcoming and eager to make sure we enjoyed our stay (we did!).
The only downside is it's a bit of a walk to the town center (it's a beautiful walk though).
If you plan on visiting Rehoboth and are looking for a place to stay, Silver Lake Guest House should definitely be on your short list.