We had a lovely stay in Geoff's flat. Geoff himself was LGBT+ friendly and this is a safe neighbourhood to be queer, we had no issues at all. It's a great location, we went to Mercato Metropolitano in Elephant and Castle, which has amazing food and drink options.
The flat itself was very clean and well appointed, with lots of light, a fully equipped kitchen, and good water pressure. Geoff was very flexible with our check in time and there to greet us and show us the ropes.
The only potential downside is that noise carries through the building a lot - we could hear neighbours' music and conversations, footsteps and door slammings etc, in the day and the night. We were glad to have brought earplugs, and we both had a good night's sleep with them in. It's not something huge or that will ruin your trip in the slightest, but good to be aware of and make adjustments for!
Overall, an excellent host and Airbnb, I'd happily come back any time!