@Barbara I will go out on a limb here. I have used tents from Macpac, MSR, Kathmandu, Mont and some others over the years. The Kathmandu I have is a one person tunnel, and I don't like it very much. And as you are looking for a two person tent, its limitations won't really be a worry. The Macpac and Mont might be difficult to get in Europe, but they illustrate the sorts of characteristics you might want to consider in your selection.
The Macpac is my favourite - but at 2.8kg it is too heavy for extended walks, I can tolerate carrying it for overnighters or for a long weekend where it gets set up in a base camp, but wouldn't be my choice for extended walks over several days. Their current offering here is the
Apollo. It is the least cramped and most versatile of the two-person tents that I have used recently, with good waterproofing (10,000 mm hydrostatic head on the floor, 1500 mm on the walls).
I have used the precursor to the MSR Zioc (the Hubba Hubba). This was a good design let down somewhat by the waterproofing of the floor, which did start to get damp when used on wet grass. I think of this almost as a summer tent, although I have seen it described as three-season on some sites. Perhaps I am being a little harsh here, but I suspect that if you are using it to camp in someone's fields (with permission of course) that will involve a fair bit of camping on damp grass or similar damp surfaces. The floor and walls seem to have the same water resistance, at 5,000 mm hydrostatic head. At around 2.2 kg in the configuration I tried, it was also a little heavier than I wanted.
Having tried the MSR Hubba Hubba, I looked for an alternative, and selected the
Mont Moondance 2. Mine is an older model which has a slightly tapered floor plan rather than the rectangular plan of the current version. It can be erected fly first, or even fly only if you have a suitable groundsheet, are comfortable 'cowboy camping' or just want to do a quick erection to get out of the rain. This has a more reasonable waterproof floor for three-season use (10,000 mm hydrostatic head, and 2000 mm on the walls). Mine is just on 1.9 kg with a full set of pegs. It can be erected with as few as two pegs, but I have never tried that.
I had a quick look at the ZPacks Duplex specifications, and it certainly stacks up well, as one might expect with products from that company, when looked at from the specifications alone. It is also expensive.
@davebugg or others who have used it might be able to share their experience with its utility and durability.
There are clearly compromises here between weight, cost, waterproofing, spaciousness, accessibility, etc, etc. If you don't need a three-season tent, you will find plenty of reasonably inexpensive and relatively lightweight options.
@David has provided a link that illustrates that. Really lightweight options, under 2 kg, will be getting more expensive, and even then still might not have the waterproofing to be reliably more than a one-season tent. Good floor waterproofing (10,000 mm of hydrostatic head or greater) and reasonable wall waterproofing seem to be the features that separate the really good lightweight tents from the rest at this end of the market.
As for my tunnel tent, I can only just sit up in it, and my old body no longer has the flexibility to change clothing without stepping outside. For me, it is little better than using a swag/bivvie, which would be around half the weight.