I’ve lived close to where you are looking for a few years.
Eltham itself is a bit unreconstructed compared to some other parts of SE London (so will inevitably attract a couple of people on here telling you they could neverrrrrrr and buy a house you can’t afford in Blackheath instead), but increasingly less so. There’s a pub that does craft beer, one with a regular “bring your baby” quiz, and lots of coffee shops - around the area you’re looking in particular, there’s Westmount Cafe, Taste and Chez Maitre by way of cafes. There’s also a bakery (which does really good vegan sausage rolls, so good they’ve ruined the Greggs ones for me) and a deli on Westmount Road. On the other end of the culinary spectrum, I think Well Hall Road may literally have every pizza chain known to man (and a Morley’s).
The parks are really great. I have a small child so currently favour the flatter parks like Eltham Park South or Avery Hill Park, but if you catch Oxleas Woods on the right morning, it’s an incredible view.
It’s not a big rental area - lots of people have lived here for decades, and there’s a real sense of community in parts. The Progress Estate has community events on the greens, for example, and I’m sure other areas have their equivalent. It has the usual petty and occasionally less petty crime, but I’m fairly sure the specific bit you’re looking in has some of the lowest crime stats in Greenwich so, you know, keep comments on places like nextdoor in perspective.
Downsides - transport can sometimes be a pain, particularly since SE messed up the national rail timetables. It’s an easy bus to the Lizzie Line but at peak times you’ll be stuck behind half of Kent on the journey there. Restaurants for an evening meal remain a bit lacking tbh, although Chislehurst and Blackheath aren’t far if you can’t be arsed going more central. Finally, it’ll take a long time for the place to throw off the shadow of the Stephen Lawrence murder (although I am half Middle Eastern and haven’t personally experienced any issues)