YES. Vienna's established diplomatic track record for JCPOA talks, offering crucial neutrality, positions it as the default venue for any renewed US-Iran engagement. P5+1 precedents strongly indicate Austria as the optimal, uncontroversial site for initial diplomatic probes. Geopolitical calculus prioritizes proven ground over novel locations for high-stakes dialogues. Sentiment: Consistent reports of potential de-escalation favor an established, neutral facilitator. 88% YES — invalid if an intermediary like Oman hosts the first bilateral meeting.