My mission was a very great experience! It was hard, especially because of covid. But I'm still really glad I went, and I would do it again.
The best part of my mission was probably the first 6 months I was in the field, and not just because of covid. I served in a little Spanish branch, which meant that there were less than a dozen families in the branch. If you serve in any area for a long time, you get to know some of the members, and really grow to love them. Since we had such a small group, I had more than enough time to get to know each and every member, and it became almost like a second home. There were also some amazing people we taught in that area, who were baptized, and we had some amazing miracles happen with them!
As for any part I really didn't like... I'd say a lot of the time during covid. I think fall/winter of 2020 was probably the hardest part. I wouldn't say I've ever really dealt with seasonal depression before, but it hit hard then. When we only get to interact with people (besides our companions) face to face two or three times a week, it got lonely for a lot of us. Zoom is nice, but it's just not the same. What made it worse was that I got moved to an area without a car, just a couple weeks before we were allowed to meet in-person again, and we had to bike a couple miles of straight uphill just to get into our area... It was rough. But it got a lot better after that! Things started to get back to normal, and that area got combined with an area with a car when I got moved to a different area a little while later.