On the freeway it's iffy at best. Unlike the Fiat Brava, this is not the kind of car you would take on a long freeway trip. Even at 110km/h it doesn't feel very stable and because of its height, you're at mother nature's mercy should there be crosswinds.
To sum it up, it's an average at best car if you're planning on doing mostly city trips and if you get a new car every couple of years. I don't see it as a viable option as a long term car or if you do a lot of freeway driving. As mentioned above, it's not a comfortable car for long trips and the mediocre-at-best built quality ensures this car will be plagued with issues in ten or so years. I absolutely adore Renault and I'm a big fan of a lot of cars they've made in the past but for the most part they messed this one up.
Note: this is now the last generation Modus. Renault barely came out with a refreshed one which I have not yet driven. A long wheelbase variant of it is now available which should help it gain some needed trunk space.