Nuna - PIPA next

Hey, I am basically you, but a year down the road. I live on the second floor (no elevator) and don't drive. I have (and recommend) the Nuna Triv Next with the regular Pipa car seat, which has the longest life of the Pipa line. You might be able to find an adaptor on Etsy for another car seat.  I used the carseat in the stroller until my baby was about eight months and could sit up independently in the regular stroller seat. No base is required to be installed in the stroller or in the car.  The bassinet attachment option isn't approved for use in my country, and I was fine with the car seat in its stead.  The stroller itself folds up with an easy pull and lift of the handle. This can be done with one hand. It's light to carry up and down the stairs, and when folded takes up hardly any room.  Upside: The stroller seat and car seat can be set to parent-facing or world-facing. The Minu does not have this functionality. (Don't know about the other one you mentioned.) Parent-facing is great because you can look at them, talk to them, keep an eye on them, and see what they're looking at. Studies have shown that young babies in world-facing mode experience a lot of anxiety. They also can have delayed language development. Many benefits to facing your child!! Plus they are cute af and you'll want to look at them.  Downside: The basket has only a 10 lb weight limit. The mesh is not nearly as sturdy as those I've seen on the Uppababy line.  Let me know if you have any questions! 

Nuna strollers and car seats with specifically the merino lining. The lightest version of the Pipa that had a reflex clip in base and could be used without the base. Things that we got after attempting alternatives because we love traveling: A dedicated travel stroller that fits in the overhead of airplanes. Cybex libelle. The travel bag for the nuna pipa car seat. The seat is light and so it’s a good item have as a backpack. You can also jam a load of diapers in the space saving previous suitcase space. Baby Bjorn Travel Crib. It’s so light and easy to set up. Gave us much more options for locations we could stay.

I have two car seats in the back - Nuna Rava and Pipa. There is still some space but the middle seat is purely a cup holder. We use a travel stroller (Yoyo) and it fits in the trunk easily. Not the best family car but a great daily driver with or without the kids.

Second this with the Nuna Pips and adaptors

We used a Nina Pipa - I think we needed to get adapters for the Vista but it worked great.

We went from Pipa to Revv and Rava. I know the weight and height limitation on the Revv is lower than on the Rava, but let me tell you, the Revv has a way better build quality than the Rava. Also much easier to take cover off to wash, clean, etc

My baby hated her pipa infant car seat 😭. We ended up switching to the convertible car seat at 3-4 months because of this. It looked like she was sliding down and I had to use a rolled up cloth to keep her in place, she was uncomfortable. Felt that was pretty annoying especially given the expensive price.

Nuna makes an awesome infant carrier we just got two bases

We have one but honestly the price tag just doesn’t make sense unless you’re really sold on it and it fits your stroller needs. We really liked the concept of being able to use it without a base, but the way it functions without the base is pretty annoying (strap across lap). It’s light, but they all get heavy fast, so that’s similarly not something that rises to the price tag, IMO.

The fact that my Nuna weighs less than 9 lbs is why I own it, every person who’s ever grabbed the seat has complimented how lightweight and easy it is to maneuver. And I’d buy it over and over again!