Mikrotik does great stuff, but it's a big step up from Linksys in terms of customization and the need to know what you're doing. But you get a lot of features for a good price. Wi-Fi is not the strongest, but a good box for an apartment.
Ubiquiti NanoStation locoM2 2.4GHz airMax 8dBi CPE - Indoor/Outdoor High Performance Wireless Device
30 Review
MikroTik Dual-Concurrent Access Point: hAP ac Lite RB952Ui-5ac2nD-US
79 Review
MikroTik RB941-2nD RouterBoard hAP Lite: Affordable 2.4GHz Home Access Point
71 Review
Mikrotik RouterBOARD 951Ui-2HnD RB951Ui-2HnD: High-Power 2.4Ghz Wireless AP with 5x10/100 Ports and OSL4
73 Review
π CERRXIAN RS232 to Ethernet Serial Device Server - TCP/IP Converter with 1Port DB9 RS232 Serial to Ethernet Connectivity
3 Review
UGREEN USB 3.0 Ethernet Adapter Hub with RJ45: Fast Gigabit Ethernet Converter, 3 Ports USB 3.0 Hub Compatible for MacBook, iMac, Surface Pro, Chromebook, Laptop, PC
11 Review
π USR-TCP232-410s: RS232/RS485 Serial to Ethernet Adapter/IP Device Server with DHCP/DNS Support
4 Review
HB-UMLS Sabrent USB 2.0 Hub with 4 Ports and LED Power Switches for Each Port
12 Review