this provides plenty of room for 2 adults (although very tall adults may struggle and may need to sleep diagonally in some of these)
the fly will hopefully provide reasonable rain and wind protection (up to 40-50kph gusts)
the floor should be waterproof enough that it doesn't leak if rain pools under it (better still, if possible choose a site where water will not pool under your tent)
ensure the seams are “seam sealed” otherwise they will not be waterproof!
it will be super easy to set up if it has aluminium alloy poles (AVOID fibreglass poles which need to feed through sleeves as they will frustrate you in setting up and packing up)
the basic ones will have just two poles, while the more expensive ones will have a 3rd cross-bar pole which provides for straighter walls which gives you more headroom inside
it should have upper and lower level ventilation capability - a breeze is critical during the daytime in particular in summer
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if you have left you buying to the last minute and you are on a tight budget then you could go for something like a Spinifex Nakara but it has fibreglass poles and polyethylene floor - neither of which I am a fan, plus it only has one door, but at least it has two side windows for ventilation