Peter was a great host - he responded quickly to my messages, he waited more than 2 hours for us to arrive (our flight was significantly delayed), he provided many local tips, including for great places to eat nearby, and he was very warm and welcoming.
His place is not exactly downtown, but there's very convenient public transportation or if you like to walk - it's 20 minutes to get to river Liffey; renting a bike is also an option with a biking station just a minute or two from the house. Also the neighbourhood is lovely and quiet and there are some pretty great places to eat nearby.