This is an exciting although very dangerous time for Winston. Amidst the enormous frustration and angst in his life he appears to have made contact with an attractive younger lady who may share his hatred of the regime that they live under. In fact this turns out to be true. Julia later says to him,
"It was something in your face...As soon as I saw you I knew you were against them" (p. 128).
Winston is willing to take the risk that Julia is not leading him into a trap as a member of the Thought Police. He is also willing to take the risk that he won't be caught by the Party's all pervasive surveillance. He muses that even in the countryside it wasn't much safer than London,
"There were no telescreens, of course, but there was always the danger of concealed microphones...." (p. 123).
It is to Winston's relief that he later learns that Julia has chosen the meeting place well; it is in a clearing with trees too small to conceal microphones.
Winston's secret meeting with Julia reveals several important aspects of their characters. One is that Winston is willing to take risks in trusting others which could rapidly bring about his downfall. In Julia's case we are introduced to a character who delights in her ability to deceive the Party and create her own space for personal enjoyment. The lengths to which the Party goes to monitor its citizens also yet again reminds the reader of the terribly repressive nature of this society.
There was a quote where there was no telescreen or concealed microphone to record their small act of rebellion. This is most significant in my opinion.