at Wembley Stadium which was played in front of a tournament record attendance of 89,267 (Image: PA)
"We played in front of the biggest crowd ever, against Ireland at Wembley, we had the biggest comeback in World Cup history when we beat Canada in Leicester and we also played at the Olympic Stadium," he said.
"So those highlights are very good.
"Winning the Rugby Europe Championship last year, for the first time in 12 years, was pretty good as well."
But then, in March, Howells' time in charge came to an end, as he resigned along with his two assistants, Scottish backs coach Rob Moffat and Italian forwards coach Massimo Cuttitta.
Explaining his departure, he said: "It was two-fold really.
"We lost to Spain in a World Cup qualifier and everyone was pointing fingers everywhere.
"But to be perfectly honest it was a culmination of time out there.
"I had gone as far as I could with the group of players. I had come to the end of my time.
"When you get a result like Spain, which looked like it was going to cost Romania a World Cup spot, you have to take responsibility."
As it turned out, there was to be a further twist in the qualification saga, as Spain lost to Belgium in Brussells, which meant Romania taking the automatic spot in the finals after all.
It was a hugely controversial game with the Spanish fuming over the officiating of Romanian referee Vlad Iordachescu and a number of their players confronting him after the final whistle, resulting in lengthy bans for five of them.
And still the saga continues, with an investigation having been ordered into Romania, Spain, and Belgium possibly using ineligible players, which may affect qualifying for the World Cup.
"It is still going on. It is incredible," said Howells.
"I can not believe how World Rugby and European Rugby can not come to a decision on this.
"I watched the game in Brussles. I know it was a Romanian referee, but Spain had four or five clear-cut opportunities to win the game and didn't score.
"They can't blame the referee for that. That's their problem.
"It was an easy thing to do, point the finger at the referee, but it was Spain's fault they didn't qualify.
"All of a sudden it has kicked off again with talk of ineligible players.
"You could end up with a situation where there is nobody out of that competition qualifying because everybody has pointed a finger at everybody else about fielding ineligible players. I don't know where they go then. It's just farcical to be honest.
"There is supposed to be a game in next week or so, with the second team in the group playing Portugal in a knock-out tie and nobody knows who that is!"