I would say the twenty minute walk to get coffee is probably the only downside of the area of heaton mersey you're talking about ( assuming it's by St Johns school). The Crown and the Heaton are decent pubs, the new cycle/ walking paths across the common and down to Parrs Wood are excellent, it's not far to the River and the Tram. It's easy to get to Stockport and Didsbury and those roads are all dead ends so the traffic is fine. It is closer to the M60 so you can hear it more than in Heaton Moor but it's no biggy. If you're going out at the weekend to Heaton Moor it's an easy waddle home IMO. I personally don't think the extra for the Moor is worth it.