Looking for a Double Room /annex

Hello my name is Lisa-May. I am single professional looking for a suitable self contained annex in Milton keynes and Bedfordshire area. initially looking for short to long term. Starting from £900 inclusive of bills . I work from home and have a small French Bulldog. Need something that has garden access and private entrance. We are at a transitioning phase so open to explore opportunities that work well. private person but friendly, respectful and considerate.